英语语法——省略2

　　其他省略

　　1、连词的that省略

　　(1)宾语从句中常省略连词that，但也有不能省略的情况。

　　(2) 在定语从句中，that在从句中作宾语时可省略.另外，凡是进行时态和被动语态的定语从句都可省略关系代词和be 动词。

　　2、在某些状语从句中，从句的主语与主句的主语一致时，可省去“主语+be”部分

　　(1) When (he was) still a boy of 10, he had to work day and night.

　　(2) She tried her best though (she was) rather poor in health.

　　(3) If (you are) asked you may come in.

　　(4) If (it is) necessary I’ll explain to you again.

　　3、不定式符号to的省略

　　(1) 并列的不定式可省去后面的 to.

　　I told him to sit down and wait for a moment.

　　(2) help 当“帮助”讲时，后面的宾语或宾补的不定式符号to可带可不带.

　　I will help (to) do it for you.

　　I will help you (to) do it.

　　（3）介词but前若有动词do,后面的不定式不带 to.

　　The boy did nothing but play.

　　(4) 某些使役动词（let, make, have）及感官动词（see, watch, hear, notice, observe, feel, look at, listen to等）后面作宾语补足语的不定式一定要省去 to, 但在被动语态中须将to 复原。

　　I saw the boy fall from the tree. 

　　The boy was seen to fall from the tree.

　　The boss made us work 12 hours a day.

　　We were made to work 12 hours a day.

　　(5) 主语从句中有动词do,后面作表语的不定式的 to可带可不带。

　　All we can do now is (to) wait.

　　(6) find 当“发现”讲时，后面作宾语补足语的不定式符号to可带可不带。

　　We found him (to) work very hard at the experiment.

　　但如果是不定式 to be，则不能省略。

　　She found him to be dishonest.

　　4、连词if在部分虚拟条件句中可省略，但后面的语序有变化。

　　(1) Had they time, they would certainly come and help us.

　　(2) Were I you, I would do the work better.

　　(3）Should there be a flood, what should we do?

　　5、主句和从句各有一些成分省略。

　　The sooner (you do it), the better (it will be).