1、省略主語 祈使句中主語通常省略；其它省略主語多限于少數(shù)現(xiàn)成的說法。
(1) (I) Thank you for your help.
(2) (I) See you tomorrow.
(3) (It) Doesn’t matter.
(4) (I) Beg your pardon
2、省略主謂或主謂語的一部分
(1) (There is) No smoking .
(2) (Is there) Anything wrong ?
(3) (Will you) Have a smoke ?
(4) What/How (do you think) about a cup of tea ?
(5) Why (do you) not say hello to him ?
3、省略作賓語的不定式短語，只保留to，但如果該賓語是動詞be或完成時態(tài)，則須在之后加上be或have:
(1) –Are you going there? --Yes, I’d like to (go there).
(2) He didn’t give me the chance, though he had promised to (give me the chance).
(3) –Are you an engineer? --No, but I want to be.
(4) –He hasn’t finished the task yet. --Well, he ought to have.
4、省略表語
(1) –Are you thirsty? --Yes, I am (thirsty).
 

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