1.对话中内容省略

　　“Will you join us?” “I'd love to”

　　“I'm hungry. ” “Are you?”

　　“What did you buy?” “A dictionary.”

　　2.不定式省略

　　I'll buy the tickets if you want me to.

　　I meant to write to you， but forgot to.

　　3.并列句中成份省略

　　He majors in French and I in Russian.

　　They tried to help her， but in vain.

　　4.复合句中成份省略

　　Look out for cars when crossing the street.(look out 当心)

　　To criticize like him one must be as wise.

　　5. do有时用于省略句中，替代上文出现的动词及其宾语。如：

　　Computers are supposed to save time， but I'm not so sure they do. (save time)

　　be supposed to do sth.：

　　1. 被期望或被要求做某事

　　They were supposed to be here an hour ago.

　　2. 用于否定句中，获准做某事。

　　You're not supposed to play football in the classroom.

　　“The old house belongs to the Greens.”

　　“Oh， no， ________.”(答案 C)

　　A. it mustn't B. it hasn't C. it doesn't D. it didn't

　　(belong to 属于)

　　省略句常运用于是常对话的上下文中。如I think so， I'd love to， I'm afraid not 等。句型“Why not …?”以及动词do也常在考核点之列，考生应注意Why not 后面接动词原形，而动词do或其过去式常可以用来代替上文中的动词及其宾语、表语。

　　1.Why not ________ as she likes ?

　　A. let her to do B. letting her to do

　　C. let her do D. lets her do

　　(答案 C)

　　2.“I'll ring her up when I go out to lunch.”

　　“Why not do it now?”(it代替的是ring her up)

　　3.She plays the piano better now than she did last year.

　　(did代替的是played the piano)

　　4.“Who broke the window?”

　　“I did.”(did代替的是broke the window)