1. Ôn tập lý thuyết câu bị động
1.1. Công thức câu bị động
Công thức câu bị động của 12 thì:
STT | Bị động theo thì | Công thức | Ví dụ |
---|---|---|---|
1 | Câu bị động thì hiện tại đơn | S + am/is/are + V3 (pp) | The house is being painted by a worker. (Ngôi nhà đang được sơn bởi một công nhân.) |
2 | Bị động hiện tại tiếp diễn | S + am/is/are + being + V3 (pp) | The car is being fixed by the mechanic. (Chiếc xe đang được sửa chữa bởi thợ máy.) |
3 | Bị động hiện tại hoàn thành | S + have/has + been + V3 (pp) | The report has been finished by the secretary. (Báo cáo đã được hoàn thành bởi thư ký.) |
4 | Bị động hiện tại hoàn thành tiếp diễn | S + have/has + been being + V3 (pp) | The students have been being taught English for two years. (Học sinh đã được học tiếng Anh hai năm.) |
5 | Bị động quá khứ đơn | S + was/were + V3 (pp) | The letter was sent yesterday. (Lá thư đã được gửi đi hôm qua.) |
6 | Bị động quá khứ tiếp diễn | S + was/were + being + V3 (pp) | The children were playing in the park when it started to rain. (Trẻ em đang chơi trong công viên khi trời bắt đầu mưa.) |
7 | Bị động quá khứ hoàn thành | S + had + been + V3 (pp) | The work had been finished before the deadline. (Công việc đã được hoàn thành trước hạn chót.) |
8 | Bị động quá khứ hoàn thành tiếp diễn | S + had + been being + V3 (pp) | The house had been being built for six months when I arrived. (Ngôi nhà đã được xây dựng trong sáu tháng khi tôi đến.) |
9 | Bị động tương lai đơn | S + will be + V3 (pp) | The house will be painted next week. (Ngôi nhà sẽ được sơn vào tuần tới.) |
10 | Bị động tương lai tiếp diễn | S + will be being + V3 (pp) | The meeting will be being held at 9 a.m. tomorrow. (Buổi họp sẽ được tổ chức vào lúc 9 giờ sáng mai.) |
11 | Bị động tương lai hoàn thành | S + will have been + V3 (pp) | The project will have been completed by the end of the year. (Dự án sẽ được hoàn thành vào cuối năm.) |
12 | Bị động tương lai hoàn thành tiếp diễn | S + will have been being + V3 (pp) | The house will have been being built for six months by the time you arrive. (Ngôi nhà sẽ được xây dựng trong sáu tháng vào thời điểm bạn đến.) |
Ôn tập kiến thức: Các thì trong tiếng Anh
Công thức câu bị động đặc biệt:
STT | Công thức | Ví dụ |
---|---|---|
1 | Have/Get + something + V3 (pp) | I had my hair cut yesterday. (Tôi cắt tóc hôm qua.) |
2 | Have/Get + something + being + V3 (pp) | I got my car fixed last week. (Tôi đã sửa xe tuần trước.) |
3 | Be + supposed to be + V3 (pp) | The report is supposed to be finished by tomorrow. (Báo cáo dự kiến sẽ được hoàn thành vào ngày mai.) |
4 | Be + said to be + V3 (pp) | She is said to be a very talented artist. (Cô ấy được cho là một nghệ sĩ rất tài năng.) |
5 | It + be + V3 (pp) | It is believed that the Earth is round. (Người ta tin rằng Trái đất hình tròn.) |
6 | It + be + adj + for something + to be + V3 (pp) | It is important for the work to be finished on time. (Việc hoàn thành công việc đúng hạn rất quan trọng.) |
Công thức câu bị động kép:
STT | Công thức | Ví dụ |
---|---|---|
1 | S + is/ was + supposed/ said/ believed to be + V3 (pp) + by O | The report is supposed to be finished by the secretary by tomorrow. (Báo cáo dự kiến sẽ được hoàn thành bởi thư ký vào ngày mai.) |
2 | It + is/ was + V3 (pp) + that + S + (should/ could/ would) + be + V2 (pp) | It is recommended that the work should be finished on time. (Người ta đề nghị công việc phải được hoàn thành đúng hạn.) |
1.2. Cách chuyển câu chủ động sang câu bị động
Bước 1: Xác định ngữ chủ và động từ chính của câu chủ động.
Bước 2: Chọn thì phù hợp cho câu bị động dựa trên thì của câu chủ động.
Bước 3: Thay đổi ngữ chủ thành bị động (by + Agent) nếu cần thiết.
Bước 4: Chuyển động từ chính sang dạng V3.
Ví dụ:
- Câu chủ động: The student reads a book. (Học sinh đọc sách.)
- Câu bị động: A book is read by the student. (Sách được đọc bởi học sinh.)
2. Bài tập câu bị động có đáp án
2.1. Bài tập câu bị động về các thì
Bài tập 1: Chuyển các câu chủ động sang câu bị động
- People use water.
- Jane will finish the report.
- The committee was planning the festival.
- A chef had prepared the meal.
- The technician has repaired the computer.
- The scientists are developing a new technology.
- Someone will clean the room later.
- They had sent the invitations before the holiday.
- She is going to write a book.
- The students are writing tests.
- The police have arrested the suspect.
- The manager will have completed the procedure by tomorrow.
- They are going to paint the house next week.
- The gardener was watering the plants.
- My brother has been fixing the bike.
- The company had been operating the machine before the inspection.
- Someone will have repaired the bridge by next month.
- They have been renovating the museum for over a year.
- The teacher is going to correct the assignments tomorrow.
- The agency will have been organizing the event by the time we arrive.
Đáp án:
- Water is used.
- The report will be finished by Jane.
- The festival was being planned by the committee.
- The meal had been prepared by a chef.
- The computer has been repaired by the technician.
- A new technology is being developed by scientists.
- The room will be cleaned later.
- The invitations had been sent before the holiday.
- A book is going to be written by her.
- Tests are being written by the students.
- The suspect has been arrested by the police.
- The procedure will have been completed by the manager by tomorrow.
- The house is going to be painted next week.
- The plants were being watered by the gardener.
- The bike has been being fixed by my brother.
- The machine had been being operated by the company before the inspection.
- The bridge will have been repaired by next month.
- The museum has been being renovated for over a year.
- The assignments are going to be corrected by the teacher tomorrow.
- The event will have been being organized by the agency by the time we arrive.
Bài tập 2: Chọn đáp án đúng
- The report ______ by the team yesterday.
- (A) was written
- (B) were written
- (C) is written
- (D) are written
- The flowers ______ by the gardener every morning.
- (A) are watered
- (B) is watered
- (C) were watered
- (D) will be watered
- The presentation ______ by Dr. Smith last week.
- (A) was given
- (B) were given
- (C) is given
- (D) are given
- The machine ______ by technicians as we speak.
- (A) is repaired
- (B) are repaired
- (C) is being repaired
- (D) are being repaired
- The new policy ______ across all departments by next year.
- (A) will be implemented
- (B) will have been implemented
- (C) was implemented
- (D) is implemented
- The stolen jewels ______ by the police.
- (A) were recovered
- (B) was recovered
- (C) are recovered
- (D) is recovered
- The funds ______ through the charity event.
- (A) were raised
- (B) was raised
- (C) are raised
- (D) is raised
- The novel ______ by the famous author by the end of this year.
- (A) will have been written
- (B) will be written
- (C) was written
- (D) is written
- The documents ______ to the office yesterday.
- (A) were sent
- (B) was sent
- (C) are sent
- (D) is sent
- The problem ______ by the team before the deadline.
- (A) was solved
- (B) were solved
- (C) is solved
- (D) will be solved
- The song ______ on the radio frequently.
- (A) is played
- (B) are played
- (C) was played
- (D) will be played
- The message ______ to the recipient this morning.
- (A) was delivered
- (B) were delivered
- (C) is delivered
- (D) are delivered
- The building ______ by the company next year.
- (A) will be constructed
- (B) will have been constructed
- (C) was constructed
- (D) is constructed
- The dishes ______ by Mary for 30 minutes.
- (A) were being washed
- (B) were washed
- (C) are washed
- (D) was washed
- The assignment ______ by the students last night.
- (A) was completed
- (B) were completed
- (C) is completed
- (D) will be completed
- The agreement ______ by both parties tomorrow.
- (A) will be signed
- (B) will have been signed
- (C) was signed
- (D) is signed
- The evidence ______ by the experts.
- (A) is examined
- (B) are examined
- (C) was examined
- (D) is being examined
- The announcement ______ during the assembly.
- (A) was made
- (B) were made
- (C) is made
- (D) will be made
- The cake ______ by the chef for the party.
- (A) was decorated
- (B) were decorated
- (C) is decorated
- (D) will be decorated
- The data ______ by the research team by next week.
- (A) will be analyzed
- (B) will have been analyzed
- (C) was analyzed
- (D) is analyzed
Đáp án:
- (A) was written
- (A) are watered
- (A) was given
- (C) is being repaired
- (A) will be implemented
- (A) were recovered
- (A) were raised
- (A) will have been written
- (A) were sent
- (A) was solved
- (A) is played
- (A) was delivered
- (A) will be constructed
- (A) were being washed
- (A) was completed
- (A) will be signed
- (D) is being examined
- (A) was made
- (A) was decorated
- (A) will be analyzed
2.2. Bài tập câu bị động kép và câu bị động đặc biệt
Bài tập 1: Chuyển các câu chủ động sang câu bị động
- The police officer made the suspect lie down.
- The teacher lets the students use calculators during the test.
- The committee had the worker remove the graffiti.
- The manager is having the employees work overtime.
- The coach made the team practice for an extra hour.
- The customer had the waiter bring a new dish.
- The teacher got the children to clean up the classroom.
- The director will have the staff organize a meeting.
- The homeowner let the guests stay until midnight.
- The principal had the janitor lock the gates.
- The event planner got the host to announce the winner.
- The company will have the workers assemble the new machines.
- The parents let their children play outside until it got dark.
- The teacher made the student apologize for the interruption.
- The client had the designer alter the blueprints.
Đáp án:
- The suspect was made to lie down by the police officer.
- The students are allowed/let to use calculators during the test by the teacher.
- The committee had the graffiti removed by the worker.
- The employees are being made to work overtime by the manager.
- The team was made to practice for an extra hour by the coach.
- The customer had a new dish brought by the waiter.
- The teacher got the classroom cleaned up by the children.
- The director will have the meeting organized by the staff.
- The guests were let to stay until midnight by the homeowner.
- The principal had the gates locked by the janitor.
- The event planner got the winner announced by the host.
- The company will have the new machines assembled by the workers.
- The children were let to play outside until it got dark by their parents.
- The student was made to apologize for the interruption by the teacher.
- The client had the blueprints altered by the designer.
Bài tập 2: Chọn đáp án đúng nhất (A, B, C, hoặc D) cho mỗi câu sau
- It ______ that the president will visit our city next month.
A. is expecting
B. is expected
C. expects
D. has expected - The thief ______ to have escaped through the window.
A. is believing
B. is believed
C. believes
D. has believed - This book ______ by all children. It’s a classic!
A. should read
B. should be read
C. should be reading
D. should be readed - The concert ______ to be amazing last night.
A. is said
B. said
C. was said
D. has said - It ______ that there will be a storm tonight.
A. is forecasting
B. is forecasted
C. forecasts
D. has forecasted - The suspect ______ by the police at the moment.
A. is questioning
B. is being questioned
C. questions
D. has questioned - This room ______ for the meeting. It’s not ready yet.
A. should clean
B. should be cleaning
C. should be cleaned
D. should cleaned - The children ______ to bed by their parents every night.
A. are sent
B. send
C. are sending
D. have sent - He ______ to have won a lot of money from the lottery.
A. is rumoring
B. is rumored
C. rumors
D. has rumored - Spanish ______ in many South American countries.
A. is speaking
B. is spoken
C. speaks
D. has spoken - This car ______ in Germany.
A. is making
B. is made
C. makes
D. has made - The meeting ______ until next week.
A. has postponed
B. has been postponed
C. postpones
D. is postponing - Dinner ______ by my father every evening.
A. is cooked
B. cooks
C. is cooking
D. has cooked - You ______ to arrive on time for the interview.
A. are expected
B. expect
C. are expecting
D. have expected - It ______ that he will resign next month.
A. is thinking
B. is thought
C. thinks
D. has thought
Đáp án:
- (B) is expected
- (B) is believed
- (B) should be read
- (C) was said
- (B) is forecasted
- (B) is being questioned
- (C) should be cleaned
- (A) are sent
- (B) is rumored
- (B) is spoken
- (B) is made
- (B) has been postponed
- (A) is cooked
- (A) are expected
- (B) is thought
Bài tập 3: Chia động từ trong ngoặc
- The project __________ (expect) to finish next month.
- The missing child __________ (find) safe and sound.
- This dress __________ (make) in France, not Italy.
- He __________ (say) to be a brilliant scientist.
- The lights __________ (should / turn off) before you leave.
- She __________ (know) by everyone in the neighborhood.
- The show __________ (rumor) to be cancelled after this season.
- The patient __________ (take) good care of by the nurses.
- The letter __________ (should/ write) in English.
- The stolen goods __________ (find) in an abandoned warehouse.
- He __________ (believe) to be innocent of the crime.
- The cake __________ (already / eat) by the time I got there.
- A new bridge __________ (build) across the river right now.
- The package __________ (deliver) tomorrow morning.
- This rule __________ (make) to be broken.
Đáp án:
- is expected
- has been found
- is made
- is said
- should be turned off
- is known
- is rumored
- is being taken
- should be written
- were found
- is believed
- had already been eaten
- is being built
- will be delivered
- was made
2.3. Bài tập câu bị động hỗn hợp
Bài tập 1: Chuyển các câu chủ động sang câu bị động
- The engineer designs a new software application.
- The chef has prepared a five-course meal.
- The teacher was grading the tests.
- The council will plan the new park.
- The students are writing essays.
- The scientist has discovered a new species.
- The gardener had been planting trees.
- The manager will have completed the report by tomorrow.
- The players are being trained by the coach.
- The author had written a new novel.
- The company will launch a new product soon.
- It is believed that the climate is changing.
- The director is supposed to be directing the new movie.
- The president was said to have been informed of the crisis.
- The bill must be passed by the senate.
- The project might be considered by the board next month.
- The room was found to be left untidy.
- The speech is known to have been written by the advisor.
- The painting is considered to be finished by the artist.
- The law was supposed to be enforced starting last June.
Đáp án:
- A new software application is designed by the engineer.
- A five-course meal has been prepared by the chef.
- The tests were being graded by the teacher.
- The new park will be planned by the council.
- Essays are being written by the students.
- A new species has been discovered by the scientist.
- Trees had been being planted by the gardener.
- The report will have been completed by the manager by tomorrow.
- The players are being trained by the coach.
- A new novel had been written by the author.
- A new product will be launched by the company soon.
- It is believed that the climate is changing.
- The new movie is supposed to be directed by the director.
- The president was said to have been informed of the crisis.
- The bill must be passed by the senate.
- The project might be considered by the board next month.
- The room was found to be left untidy.
- The speech is known to have been written by the advisor.
- The painting is considered to be finished by the artist.
- The law was supposed to be enforced starting last June.
Bài tập 2: Trắc nghiệm chọn đáp án đúng
- The project _____________ (complete) by the team before the deadline.
- (A) is completed
- (B) was completed
- (C) will be completed
- (D) has been completed
- The speech _____________ (deliver) by the president at the annual meeting.
- (A) is delivered
- (B) will be delivered
- (C) was delivered
- (D) has been delivered
- The research _____________ (conduct) by a team of international scientists.
- (A) is conducted
- (B) has been conducted
- (C) will be conducted
- (D) was conducted
- The decision _____________ (announce) after the board meeting next week.
- (A) is announced
- (B) will be announced
- (C) was announced
- (D) has been announced
- The evidence _____________ (review) by the legal team before the trial.
- (A) is reviewed
- (B) will be reviewed
- (C) was reviewed
- (D) has been reviewed
- The medication _____________ (administer) to the patient immediately upon arrival.
- (A) is administered
- (B) will be administered
- (C) was administered
- (D) has been administered
- The new system _____________ (implement) across all departments by the end of the quarter.
- (A) is implemented
- (B) will be implemented
- (C) was implemented
- (D) has been implemented
- The manuscript _____________ (edit) by the editor before publication.
- (A) is edited
- (B) will be edited
- (C) was edited
- (D) has been edited
- The incident _____________ (report) to the authorities as soon as it happened.
- (A) is reported
- (B) will be reported
- (C) was reported
- (D) has been reported
- The results _____________ (publish) in the journal after peer review.
- (A) are published
- (B) will be published
- (C) were published
- (D) have been published
- The project _____________ (believe) to be successful.
- (A) is believed
- (B) was believed
- (C) will be believed
- (D) has been believed
- The announcement _____________ (expect) to be made tomorrow.
- (A) is expected
- (B) was expected
- (C) will be expected
- (D) has been expected
- The book _____________ (say) to have inspired many people.
- (A) is said
- (B) was said
- (C) will be said
- (D) has been said
- The event _____________ (report) to have been very successful.
- (A) is reported
- (B) was reported
- (C) will be reported
- (D) has been reported
- The decision _____________ (find) to be unfair by many employees.
- (A) is found
- (B) was found
- (C) will be found
- (D) has been found
- The data _____________ (consider) to be unreliable.
- (A) is considered
- (B) was considered
- (C) will be considered
- (D) has been considered
- The proposal _____________ (hope) to bring positive changes.
- (A) is hoped
- (B) was hoped
- (C) will be hoped
- (D) has been hoped
- The project _____________ (suppose) to start next month.
- (A) is supposed
- (B) was supposed
- (C) will be supposed
- (D) has been supposed
- The candidate _____________ (know) to be very competent.
- (A) is known
- (B) was known
- (C) will be known
- (D) has been known
- The plan _____________ (estimate) to cost over a million dollars.
- (A) is estimated
- (B) was estimated
- (C) will be estimated
- (D) has been estimated
Đáp án:
- (C) will be completed
- (B) will be delivered
- (B) has been conducted
- (B) will be announced
- (B) will be reviewed
- (C) was administered
- (B) will be implemented
- (B) will be edited
- (C) was reported
- (B) will be published
- (A) is believed
- (A) is expected
- (A) is said
- (A) is reported
- (A) is found
- (A) is considered
- (A) is hoped
- (A) is supposed
- (A) is known
- (A) is estimated
Bài tập 3: Chia động từ trong ngoặc
- The project _____________ (complete) by the time the deadline arrives.
- The speech _____________ (deliver) by the president at the annual meeting next month.
- The research _____________ (conduct) by a team of international scientists for three years.
- The decision _____________ (announce) after the board meeting next week.
- The evidence _____________ (review) by the legal team before the trial next month.
- The medication _____________ (administer) to the patient immediately upon arrival last night.
- The new system _____________ (implement) across all departments by the end of the quarter.
- The manuscript _____________ (edit) by the editor before publication last week.
- The incident _____________ (report) to the authorities as soon as it happened yesterday.
- The results _____________ (publish) in the journal after peer review next month.
- The project _____________ (believe) to be successful by experts.
- The announcement _____________ (expect) to be made by the CEO.
- The book _____________ (say) to have inspired many people worldwide.
- The event _____________ (report) to have been very successful by the media.
- The decision _____________ (find) to be unfair by many employees.
- The data _____________ (consider) to be unreliable by the analysts.
- The proposal _____________ (hope) to bring positive changes by the stakeholders.
- The project _____________ (suppose) to start next month according to the plan.
- The candidate _____________ (know) to be very competent by the hiring committee.
- The plan _____________ (estimate) to cost over a million dollars by the consultants.
Đáp án:
- The project will have been completed by the time the deadline arrives.
- The speech will be delivered by the president at the annual meeting next month.
- The research has been conducted by a team of international scientists for three years.
- The decision will be announced after the board meeting next week.
- The evidence will be reviewed by the legal team before the trial next month.
- The medication was administered to the patient immediately upon arrival last night.
- The new system will be implemented across all departments by the end of the quarter.
- The manuscript was edited by the editor before publication last week.
- The incident was reported to the authorities as soon as it happened yesterday.
- The results will be published in the journal after peer review next month.
- The project is believed to be successful by experts.
- The announcement is expected to be made by the CEO.
- The book is said to have inspired many people worldwide.
- The event is reported to have been very successful by the media.
- The decision is found to be unfair by many employees.
- The data is considered to be unreliable by the analysts.
- The proposal is hoped to bring positive changes by the stakeholders.
- The project is supposed to start next month according to the plan.
- The candidate is known to be very competent by the hiring committee.
- The plan is estimated to cost over a million dollars by the consultants.
3. Bài tập câu bị động nâng cao có đáp án
Bài tập 1: Chuyển các câu chủ động sang câu bị động
- The engineer designs a new software application every year.
- The chef has prepared a five-course meal that amazed everyone.
- The teacher was grading the tests when the principal walked in.
- The council will plan the new park if they get the funding.
- The scientist is developing a new theory that could change everything.
- The manager will have completed the report by tomorrow unless something unexpected happens.
- They believe that the project will be finished on time despite the delays.
- The president was said to have been informed of the crisis as soon as it occurred.
- It is expected that the new policy will improve efficiency significantly.
- The company is having the website redesigned by a professional team from overseas.
Đáp án:
- A new software application is designed by the engineer every year.
- A five-course meal that amazed everyone has been prepared by the chef.
- The tests were being graded by the teacher when the principal walked in.
- The new park will be planned by the council if they get the funding.
- A new theory that could change everything is being developed by scientists.
- The report will have been completed by the manager by tomorrow unless something unexpected happens.
- It is believed that the project will be finished on time despite the delays.
- The president was said to have been informed of the crisis as soon as it occurred.
- It is expected that the new policy will improve efficiency significantly.
- The website is being redesigned by a professional team from overseas for the company.
Bài tập 2: Trắc nghiệm chọn đáp án đúng
- The project _____________ (complete) by the time the deadline arrives.
- (A) is completed
- (B) was completed
- (C) will have been completed
- (D) has been completed
- The speech _____________ (deliver) by the president at the annual meeting.
- (A) is delivered
- (B) will be delivered
- (C) was delivered
- (D) has been delivered
- The research _____________ (conduct) by a team of international scientists.
- (A) is conducted
- (B) has been conducted
- (C) will be conducted
- (D) was conducted
- The decision _____________ (announce) after the board meeting next week.
- (A) is announced
- (B) will be announced
- (C) was announced
- (D) has been announced
- The evidence _____________ (review) by the legal team before the trial.
- (A) is reviewed
- (B) will be reviewed
- (C) was reviewed
- (D) has been reviewed
- The medication _____________ (administer) to the patient immediately upon arrival.
- (A) is administered
- (B) will be administered
- (C) was administered
- (D) has been administered
- The new system _____________ (implement) across all departments by the end of the quarter.
- (A) is implemented
- (B) will be implemented
- (C) was implemented
- (D) has been implemented
- The manuscript _____________ (edit) by the editor before publication.
- (A) is edited
- (B) will be edited
- (C) was edited
- (D) has been edited
- The incident _____________ (report) to the authorities as soon as it happened.
- (A) is reported
- (B) will be reported
- (C) was reported
- (D) has been reported
- The results _____________ (publish) in the journal after peer review.
- (A) are published
- (B) will be published
- (C) were published
- (D) have been published
Đáp án:
- (C) will have been completed
- (B) will be delivered
- (B) has been conducted
- (B) will be announced
- (B) will be reviewed
- (C) was administered
- (B) will be implemented
- (B) will be edited
- (C) was reported
- (B) will be published
Bài tập 3: Chia động từ trong ngoặc
- The project _____________ (complete) by the time the deadline arrives.
- The speech _____________ (deliver) by the president at the annual meeting next month.
- The research _____________ (conduct) by a team of international scientists for three years.
- The decision _____________ (announce) after the board meeting next week.
- The evidence _____________ (review) by the legal team before the trial next month.
- The medication _____________ (administer) to the patient immediately upon arrival last night.
- The new system _____________ (implement) across all departments by the end of the quarter.
- The manuscript _____________ (edit) by the editor before publication last week.
- The incident _____________ (report) to the authorities as soon as it happened yesterday.
- The results _____________ (publish) in the journal after peer review next month.
Đáp án:
- The project will have been completed by the time the deadline arrives.
- The speech will be delivered by the president at the annual meeting next month.
- The research has been conducted by a team of international scientists for three years.
- The decision will be announced after the board meeting next week.
- The evidence will be reviewed by the legal team before the trial next month.
- The medication was administered to the patient immediately upon arrival last night.
- The new system will be implemented across all departments by the end of the quarter.
- The manuscript was edited by the editor before publication last week.
- The incident was reported to the authorities as soon as it happened yesterday.
- The results will be published in the journal after peer review next month.
Nguồn: 195+ bài tập câu bị động có đáp án chi tiết (talkfirst.vn)