(It)Doesn't matter.

　　(2)省略主谓语或主谓语的一部分。

　　(There is)No smoking.

　　(Is there)Anything wrong?

　　Why(do you)not say hello to him?

　　(3)省略作宾语的不定式短语，只保留to。

　　-Are you going there?

　　-I'd like to(go there)．

　　He did not give me the chance，though he had promised to(give me the chance)．

　　注意：如果该宾语是be动词或完成时态，则须在to之后加上be或have。

　　-Are you an engineer?

　　-No，but I want to be.

　　-He hasn't finished the task yet.

　　-Well，he ought to have.

　　(4)省略表语。

　　-Are you thirsty?

　　-Yes，I am(thirsty)．

　　(5)同时省略几个成分。

　　Let's meet at the same place as(we met)yesterday.

　　-Have you finished your work?

　　-(I have)Not(finished my work)yet.

　　2．并列句中的省略

　　在以and，but，or，therefore，so等词连接，或是没有连词而用分号的并列句中，在不影响句意的情况下，并列句中后面分句与前面分句相同的部分都可以省略。

　　They don't agree with you；neither do I(agree with you)．

　　Bob has done his homework，but Tom hasn't(done his homework)．

3．主从复合句中的省略