2017年四级语法学习：不定式

　　一、不定式的常考形式

　　1) 一般形式：

　　He decided to work harder in order to catch up with the others.

　　被动形式：

　　He preferred to be assigned some heavier work to do.

　　语法功能：表示与谓语动词同步发生

　　2) 完成形式：

　　He pretended not to have seen me.

　　被动形式：

　　The book is said to have been translated into many languages.

　　语法功能：表示发生在谓语动词之前

　　二、不定式的省略

　　1)感官动词

　　see, watch, observe, notice, look at, hear, listen to, smell, taste, feel

　　+ do 表示动作的完整性，真实性;

　　+ doing 表示动作的连续性，进行性

　　2) 使役动词have bid make let 等词后不定式要省略但同1)一样被动以后要还原to

　　三、不定式常考的考点

　　1)不定式做定语---将要发生

　　2)不定式做状语----目的

　　3)不定式充当名词功能---To see is to believe.

　　四、有些动词后只跟不定式如：

　　want，wish，hope，manage，promise，refuse，pretend，plan， offer，decide，agree，

　　expect allow sb to do,

　　causeto do , permit sb to do, enable sb to do

　　force sb to do. be more likely to do love to do

　　warn sb to do beable to do be ambitious to do.

　　begin to do . start to do

　　五、有的时候to后面要接-ing形式

　　accustom (oneself) to; be accustomed to;

　　face up to; in addition to; look forward to;

　　object to; be reduced to; resign oneself to;

　　be resigned to; resort to; sink to; be used to;

　　be alternative to; be close/closeness to;

　　be dedication/dedicated to;

　　be opposition/opposed to;

　　be similarity/similar to.