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三、动词不定式的固定用法

1. 第一“人”

the first (sb) to do

2. 表“迫使”的动词

allow sb to do allow sth; permit sb to do permit sth; enable sb to do enable sth; cause sb to do cause sth; force sb to do force sth

3. 表“倾向”的adj./V

tend to do; attemp to do; be (more) likely to do

that + 句子

be inclined to do; be apt to do; be liable to do

4. 表“目的”的名词

The function + of sth. + is to do sth.

function, goal, purpose, aim, objective, reason, intention

5.与接不定式的V或adj. 同词根的名词也接不定式

be able to do à ability to do

enable sb to do

decide to do àdecision to do

be ambitious to do àambition to do

try to do àmake great efforts to do

attempt(v.) to do àattempt(n.) to do

四、动词不定式的其它形式

1. 动词不定式的将来式

主动：be to do

被动：be to be done

表示预计要发生或按计划要发生的事情

China is to be one of the most important contries in the world.

被动式与过去分词的区别

the surfaces to be glued

the surfaces glued

2. 动词不定式的完成时

主动　　to have done

被动　　to have been done

表示不定式的动作发生在谓语之前

I’m glad to have seen your son yesterday.

3. 某些adj. 后主动表被动

This plas is difficult to come out

延伸阅读：

托福语法：全部倒装

托福语法：部分倒装

托福语法：VERY的用法

更多阅读资料：
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