对于动词不定式的各种不同形式的学习。
11、不定式的特殊句型too…to…
1）too…to太…以至于…
He is too excited to speak.
他太激动了，说不出话来。
---- Can I help you ?需要我帮忙吗?
---- Well, I’m afraid the box is too heavy for you to carry it, but thank you all the same.不用了。这箱子太重，恐怕你搬不动。谢谢您。
2)如在too前有否定词，则整个句子用否定词表达肯定， too后那个词表达一种委婉含义，意为"不太"。
It’s never too late to mend.(谚语)
改过不嫌晚。
3)当too前面有only, all, but时，意思是：非常…等于very。
I’m only too pleased to be able to help you.我非常高兴能帮助你。
He was but too eager to get home.他非常想回家。
12、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。∏岬憬ィ鹁蚜擞ざ? 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。
13、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?
14、不定式的时态和语态
时态\语态主动被动
一般式 to doto be done
进行式 to be doing
完成式 to have done to have been done
完成进行式 to have been doing
1)现在时：一般现在时表示的动词，有时与谓语动词表示的动作同时发生，有时发生在谓语动词的动作之后。
He seems to know this.
I hope to see you again. = I hope that I’ll see you again.我希望再见到你。
2)完成时：表示的动作发生在谓语动词表示的动作之前。
I’m sorry to have given you so much trouble.
He seems to have caught a cold.
3)进行时：表示动作正在进行，与谓语动词表示的动作同时发生。
He seems to be eating something.
4)完成进行时：
She is known to have been wreaking on the problem for many years.
15、动名词与不定式
1）动名词与不定式的区别：
动名词表达的是：状态，性质，心境，抽象，经常性，已发生的
不定式表达的是：目的，结果，原因，具体，一次性，将发生的
2）接不定式或动名词，意义相同。
3）动名词与不定式语义不同的有11组：
1stop to dostop doing
2 forget to do forget doing
3remember to doremember doing
4 regret to do regret doing
5cease to do cease doing
6 try to dotry doing
7go on to do go on doing
8 afraid to do afraid doing
9interested to dointerested doing
10 mean to do mean doing
11 begin/ start to do begin/ start doing
