动词不定式的用法什么时候用动词不定时?动词不定时干嘛用的?只要是动词不定时就表示将来?还有什么时候句子要加to（我只晓得

动词不定式的用法
什么时候用动词不定时?动词不定时干嘛用的?只要是动词不定时就表示将来?
还有什么时候句子要加to（我只晓得宾补的时候要+to）

1．用在感觉动词see,watch,notice,look at,hear,listen to,feel等后,作为宾语补足语,动词不定式不带to.如：
We often heard them sing．我们常常听到他们唱歌.
I saw her walk into the headmaster's office．我看见她走进了校长办公室.
2．用在使役动词make,let,have等后,作为宾语补足语,动词不定式不带to.如：
What makes you think I'm a farmer?你怎么认为我是一个农民?
Now let me hear you play．现在让我听你演奏.
I'll have my brother repair the radio for you．我要让我哥哥给你修理收音机.
注意：感觉动词see,hear,watch,notice,feel,look at,listen to和使役动词let,make,have等用于被动语态时,动词不定式作为主语补足语则要带to.如：
She was heard to sing in the next room．有人听到她在隔壁房间里唱歌.
3．用在 had better,had best（最好）,would rather（宁愿）等结构后,词不定式不带to.如：
I'd better go and look for him．我最好现在就去找他.
You'd best get there before lunch．你最好午饭前到达那儿.
We would rather wait till tomorrow．我们宁愿等到明天.
4．两个或两个以上句法功能相同的动词不定式并列使用时,通常只是第一个动词不定式带to,后面的动词不定式则不带to.如：
So he decided to go and get some medicine for his cough．因此他决定去买点咳嗽药.
They began to read and write．他们开始读和写.
5．用在“Will you
please+动词不定式”一类表示邀请或命令的句型中,动词不定式不带to.如：
Will you please bring me some chicken?请你给我带点鸡肉来好吗?
Will you please ask her to call me tomorrow?请你让她明天给我打个电话好吗?
6．用在由“Why…”或“Why not…”一类表示建议的句型中,动词不定式不带to.如：
Why not join us?（＝Why won't you join us?）为什么不加入到我们当中来呢?
Why spend so much money?为什么花这么多钱呢?
7．用在助动词will,shall,would,do和情态动词can,may,must,need,dare等后,动词不定式不带to.如：
I can sing in English．我会用英语唱.
I think it'll fit me quite well before long．我想这（件大衣） 很快就会合身的.
Unfair!How dare you
say that?不公平!你怎么敢这么说?
注意：ought to,have to中的to不能少.dare和need用作实义动词时,它后面的动词不定式要带to.如：
The girl doesn't dare to swim in the river．这女孩不敢在河里游泳.
8．用在动词help后作为宾语补足语,动词不定式既可以带to,也可以不带to.如：
Will you help me repair my bike?请你帮我修理一下自行车好吗?
Li Ping often helps me（to）do my lessons．李平经常帮助我做功课.
9．用在do anything（nothing,everything）but或except一类结构后,动词不定式不带to.如：
Can't you do anything but ask silly questions?难道你只会提些愚蠢的问题吗?
There is nothing to do except wait until the rain stops．除了静候雨停之外别无办法