7.9 省to 的动词不定式 1） 情态动词 ( 除ought 外，ought to)： 2） 使役动词 let, have, make： 3） 感官动词 see, watch, look at, notice...

7.4 It's for sb.和 It's of sb. 1）for sb. 常用于表示事物的特征特点，表示客观形式的形容词，如easy, hard, difficult, interesting, impossible等： It's very hard for him to study two languages. 对他来说学两门外语是很难的。 2）of sb的句…...

7.11 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…...

7.6 不定式作定语 不定式做定语通常要放在被修饰的词后。例如： I have a lot of work to do. So he made some candles to give light. ...

7.1 不定式作宾语 1) 动词+ 不定式 afford aim appear agree arrange ask be decide bother care choose come dare demand desire determine expect elect endeavor hope fail happen help hesitate learn …...

7.13 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? ...

7.8 用作介词的to to 有两种用法： 一为不定式+动词原形； 一为介词+名词/动名词, to 在下面的用法中是第二种，即to+ 名词/动名词：admit to承认， confess to承认，be accustomed to 习惯于， be used to 习惯于， stick to 坚持， tu…...

7.3 不定式主语 1） It's easy (for me) to do that.我做这事太容易了easy, difficult, hard, important, possible, impossible, comfortable, necessary, better; the first, the next, the last, the best, too much, too little, not …...