济南小升初英语基础知识：不定式作表语

济南小升初英语基础知识：不定式作表语为http://www.guanggao6.com整理发布，类型为小升初英语，本站还有更多关于小升初英语试卷，小升初辅导 - 小升初英语的文章。
正文：

2013年济南小升初考试中，小升初英语主要考小学学过的知识，比较简单。下面是www.guanggao6.com整理的英语基础知识，希望对大家有所帮助。

不定式作表语

不定式可放在be动词后面，形成表语。例如：

My work is to clean the room every day.

His dream is to be a doctor.

5. 不定式作定语

不定式做定语通常要放在被修饰的词后。例如：

I have a lot of work to do.

So he made some candles to give light.

6. 不定式作状语

1) 目的状语

To… only to (仅仅为了), in order to, so as to, so(such)… as to… (如此……以便……)

He ran so fast as to catch the first bus.　他飞快地跑以便赶上第一班车。

I come here only to say good-bye to you.　我来仅仅是向你告别。

2) 作结果状语，表事先没有预料到的，要放在句子后面。

What have I said to make you angry.

He searched the room only to find nothing.

3) 表原因

I'm glad to see you.

典型例题

The chair looks rather hard, but in fact it is very comfortable to ___.

A. sit　 B. sit on　 C. be seat　 D. be sat on

答案：B.　如果不定式为不及物动词，其后应有必要的介词。当动词与介词连用时，常位于"形容词+动词不定式"结构的末尾。

用作介词的to

to 有两种用法：一为不定式+动词原形; 一为介词+名词/动名词, to 在下面的用法中是第二种，即to+ 名词/动名词：admit to承认，confess to承认，be accustomed to 习惯于，be used to 习惯于，stick to 坚持，turn to开始，着手于，devote oneself to 献身于，be devoted to 致力于， look forward to 盼望，pay attention to

注意

省to 的动词不定式

1) 情态动词 ( 除ought 外，ought to)：

2) 使役动词 let, have, make：

3) 感官动词 see, watch, look at, notice , observe, hear, listen to, smell, feel, find 等后作宾补，省略to。

注意

在被动语态中则to 不能省掉。

I saw him dance. =He was seen to dance.

The boss made them work the whole night.=They were made to work the whole night.

4) would rather，had better：

5) Why… / why not…：

6) help 可带to，也可不带to, help sb (to) do sth：

7) but和except：but前是动词do时，后面出现的动词用不带to的动词不定式。

8) 由and, or和than连接的两个不定式，第二个to 可以省去：

9) 通常在discover, imagine, suppose, think, understand等词后，可以省去to be：He is supposed (to be) nice.　他应该是个好人。举例：He wants to move to France and marry the girl. He wants to do nothing but go out. 比较：He wants to do nothing but go out. He wants to believe anything but to take the medicine.

不定式的特殊句型so as to

1) 表示目的;它的否定式是so as not to do。

Tom kept quiet about the accident so as not to lose his job.　汤姆对事故保持沉默是为了不丢掉他的工作。

Go in quietly so as not to wake the baby. 轻点进去，别惊醒了婴儿。

2) so kind as to ---劳驾

Would you be so kind as to tell me the time? 劳驾，现在几点了。

不定式的特殊句型Why not

"Why not +动词原形"表达向某人提出建议，翻译为："为什么不……?" "干吗不……?"

例如：Why not take a holiday?　干吗不去度假?

如果觉得《济南小升初英语基础知识：不定式作表语》不错，可以推荐给好友哦。