语法填空中怎么知道要填不定式

谓语动词是组成句子的其中之一主干，要通过句子的结构来判断句子是否缺谓语

非谓语动词一般是作宾语和状语，作宾语的话要看看前面那个动词的搭配，例如，decide后面一般是decide to do sth， enjoy doing sth， finish doing sth等等。

判断时态可以通过句子的时间状语或者上下文所提示的时间状语来判断

动词不定式

1．常用形式：一般主动式to do， 一般被动式to be done

完成主动式to have done， 完成被动式to have been done

进行式to be doing

2．语法功能：可作主语、表语、宾语、宾补、定语和状语（即除谓语之外的各种成

分）。例如：

1）主语：To master a foreign language is very important.

2）表语：My job is to drive them to the company every day.

3）宾语：Do you want to visit the Great Wall?

Can you give us some advice on what to do next?

宾补：The teacher advised us to have a rest first.

I didn´t notice them come in.

注：see， hear， watch， notice， have， make， let等动词后作宾补的动词不定式不带to， 但变为被动语态以后（即不定式作主补时）要带to， （其中let sb. do sth. 变为被动式为sb. is let do sth.）

help（帮助）后作宾补的动词不定式可带to，也可不带to. 即help sb.(to)do sth.

定语：不定式位于所修饰的名词，代词之后，如：Who was the first one to set

to the top of the hill yesterday? /He is the man to depend on/to believe in.

6）状语： in order to

A．目的状语：She reads China Daily every day so as to improve her English.

to

注：in order to 可以位于句首或句中，so as to 不能位于句首。

B．原因状语： I’m glad to see you . 注：这种“be＋形容词＋不定式”结构，其不定式有时也可视为宾语，如：He is eager to go to college./ She is sure to come here.

C．结果状语：They lived to see the liberation of their home town.他们一直活到见到家乡解放。