Trong tiếng anh có những động từ mà khi theo sau là giới từ thì sẽ đổi nghĩa. Các động từ loại này được gọi là Phrasal Verbs
Phrasal Verbs là những động từ gồm 2, hoặc có khi 3 từ. Từ đầu là 1 verb và được theo sau bởi 1 adv (turn down) hoặc 1 preposition (eat into) hoặc cả 2 (put up with). Những adverbs và prepositions này đôi khi được gọi là particles.
Nghĩa của Phrasal Verbs

* _He sat down on the bed.

Nghĩa của 1 số phrasal verbs như là sit down thì có thể đoán 1 cách dễ dàng vì cả verb và particle đều giữ nguyên nghĩa gốc của nó (sit : ngồi, down : xuống; sit down : ngồi xuống)
Tuy nhiên, 1 số phrasal verbs có nghĩa đặc biệt mà bạn phải học mới biết. Ví dụ, nghĩa riêng của từng chữ put, up và with không mang chút í nghĩa gì của put up with

* Một vài particles có những í nghĩa giống nhau khi chúng được đi kèm với những verbs khác nhau.
- give up = quit
- sit down = ngồi xuống
- stand up = đứng lên
- put off = postpone (hoãn lại)

Ex: Never put off until tomorrow what you can do today.
- take off = cởi đồ, cất cánh
- put on = mặc đồ
- go on = continue
- come over = visit
- see sb off = tiễn
- come across = chợt nghĩ ra, chợt tìm thấy

- set up = establish
- give s.t away : biếu cho tặng
- push in : chen lấn

 Exercise: Choose from the four options given (marked A, B, C, or D) one best answer to complete each sentence. 

1.      They decided to postpone their journey till the end of the month because of the epidemic.

A.     put off                         B. put on                    

C. take off                        D. take on

2.      I was born in Scotland but I _________ in Northern Ireland.

A. grew up                        B. wake up                 

C. pass away                     D. get up

3.      I do not use those things any more. You can ________ them away.

A. get                                B. throw                     

C. fall                               D. make

4.      I am tired because I went to bed late last night.

A. put out                          B. kept off                 

C. brought up                   D. stayed up

5.      It took me a very long time to recover from the shock of her death.

A. take on                         B. turn off                 

C. get over                       D. keep up with

6.      The explorers made a fire to _________ off wild animals.

A. keep                             B. go                          

 C. take                             D. get

7.      Be careful! The tree is going to fall.

A. Look out                      B. look up                  

 C. look on                       D. look after

8.      Everything is ________ you. I can not make ________ my mind yet.

A. away from/ for            B. out off / on           

 C. on for/ off                  D. up to / up

9.      It’s wrongly believed that natural resources will never be _________.

A. used up                         B. used for                

C. used out                       D. used away

10. The plane is going to leave the ground.

A. take in                          B. take up                  

 C. take off                      D. take away              

11. How many countries participated in the 22^nd SEA Games?

A. took place                    B. took part               

C. took care                     D. took hand

12. The first water polo rules were __________ by William Wilson in 1876.

A. set out                          B. set on                   

  C. set up                         D. set off

13. Put out your cigarette, please. Don’t you __________ the “No Smoking: sign on the wall?

A. take after                     B. take care off         

 C. take note off             D. take notice of

14. John quit the job because he didn’t _________ his boss and workmates.

A. get acquainted with     B. get rid of               

 C. get lost of                   D. get along well with

15. She seems never to get angry. She doesn’t lose ________ of her temper.

A. control                         B. away                      

C. track                            D. touch

16. The driver skidded and ________ a dog.

A. ran                                B. ran into                 

 C. run after                    D. ran over

17. Are you going to _______ the dress _______ before you buy it?

A. try/ X           B. try/ up               C. try / on                D. try / in

18. I’m sorry, sir, but you’ve already worn these shoes. That’s why we can’t ______ them ____.

A. take / back       B. take /after     C. take / in            D. take /again

19. Are you telling the truth? Or are you __________ this story?

A. making             B. making up     C. making after          D. doing

20. Perhaps important supplies of food and minerals were suddenly __________.

A. cut out            B. cut off         C. cut down                D. cut back

21. I’d like to listen to some music. Would you please turn the radio __________.

A. on                    B. up                C. off                          D. after

22. Please try to give ________ smoking. It’s not good for your health.

A. on                   B. up                 C. in                            D. off

23. Don’t put ________ your homework anymore. The deadline is coming.

A. on                  B. after              C. off                          D. in

24. When I was young, my uncle looked ______ me because my parents were abroad.

A. after               B. up                C. on                           D. down

25. Before you enter the class, you need to fill ________ this form so that we can have your personal information.

A. on                    B. up                C. off                          D. in