Auxiliary Verbs

Bài học này được viết trong cuốn TOEIC với mục đích cho các bạn có thể học tiếng Anh. UNIT 1: AUXILIARY VERBS (Trợ động từ)

What Follows Auxiliary Verbs ?

A. Auxiliary verbs followed by a verb ending in -ing or -ed :

• The boy is flying a kite
• The book was listed as a best seller
• The boy has closed the window

B. Auxiliary verbs followed by the basic form of the verb:

Modal auxiliary, do in question/ negative sentences, or emphatic do + infinitive

• Paul may arrive tomorrow
• I do believe that he is right
• Do you like fish ?
• He does not like playing cards

Meaning of Key Auxiliary Verbs

A. Will: be willing to; intend to

• I will open the door for you
• I will be there at 8:00

B. Shall: Intend to (formal); have decided to

• Where shall we sit ?
• We shall ask the committee

C. May/Can: Be possible to do

• Can fish live in the river ?
• It may rain tomorrow

D. Can/Coul/May : Be allowed to do

• May i have one
• You can take both of them

E. Must: Be necessary; be logically certain

negative: = Can't/Cannot, must not

• This step must be next
• It must be her purse

F. Must/ Have to: be required to do

• Everyone must be on time
• They have to work late

G. Should/Ought to/Had better: Be obliged to do

• You should call her
• We ought to get there early

H. Should have / Coul have + p.p: was not true; did not happen

• She should have read the book
• They could have won, but they didn't

I. Used to / Would: Did in the past

• We used to talk every day
• In the spring, I would plant flowers