文档介绍：1
非谓语动词
1 动词不定式
定义：
不定式是动词的一种非限定形式。 不定式没有人称和数的变化，在句中不能单独做谓语。动词不定式具有名词、形容词和副词的特征， 所以它在句中可以作主语、表语、宾语、定语、状语等。
基、要求、请求、允许、命令等意义，常见的动词有 ask, tell, invite, force, advise, get , beg, allow, want, wish, order, expect, prefer, persuade, teach, warn, request, forbid, cause, permit, oblige(迫使)，encourage, lead, 等等。 如：
Mother told me to come back before 10 o’clock.
I’ll get someone to repair the recorder for you.
What caused him to change his mind?
I wish you to come as soon as possible.
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( 注意 hope虽有“希望”的意思，但其后不能用不定式作宾补, 不能说： hope sb. to do sth )
2． 不定式不用带 to 的动词有： 感官动词（see, hear, feel, watch, notice, observe）、使役动词（have, let, make ）、及动词词组 listen to , look at 后的宾语补足语。 如：
I often hear them sing this song.
I saw her put her hands into the pockets.
3 Did you notice anyone come in ?
I would have him wait for me for a long time.
Look at the horse jump.
We are listening to the radio tell a long story.
注意： 当这类动词转为被动语态时， 其后的不定式则要加上“ to” 如：
They were made to wait for two hours.
He was seen to enter the room.
Someone was heard to come up the stairs.
六．不定式作状语
不定式作状语， 修饰动词、形容词、或副词， 表示目的、结果、原因、条件等。
1． 表示目的。 如：
He went home to see his parents. To get the best result, use clean water.
Are you coming with us to see Professor Li?
不定式作目的状语，还可用 in order to , so as to 引起（in order to 可放在句首，而 so as to 不能放在句首）
In order to arrive before dark, we started early.
He decided to work harder in order to (so as to ) catch up with the others.
John hurried so as to (in order to ) be late for the party.
2. 表示结果。 如：
He returned to his bedroom to find everybody gone.
What have I said to make you so excited?
常见的表结果的句式有：
1） so…. as to… , such …as to …
He was so angry as to be unable to speak.
We are not such fools as to believe him.
2) … enough (for sb.) to …, too…to…
This book is easy enough for me to read. The ice is thick enough to walk on.
He is too young to join the army. She is too careless to notice it.
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