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?EN010...

'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。Go in quietly so as not to...'

'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 carr...'

'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 , observe, hear, listen to, smell, feel, find 等后作宾补，省略to。 ...'

'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...'

'一般现在时的用法 1) 经常性或习惯性的动作，常与表示频腮度的时间状语连用。时间状语：every…, sometimes, at…, on SundayI leave home for school at 7 every morning. 2) 客观真理，客观存在，科学事实...'

'感官动词 + doing/to do 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I saw him work in the gard...'

'begin(start) doing/to do begin/start to do sthbegin/start doing sth. 1)谈及一项长期活动或开始一种习惯时，使用doing.How old were you when you first started playing the piano?你几岁时开始弹钢琴？...'

'Morley: This is a great bike ride. I'm glad you agreed to do it.Dan: I'm beginning to think I bit off more than I can chew.Morley: Maybe it's because of that race. I should told you I used to be...'

'Dan and Morley hitch a ride in a blue truckMorley: I'm glad this guy picked us up.Dan: I called Kathy and told her we'd be in Chiaoshi in about twenty minutes.Morley: What a shame we couldn't rid...'