// 非谓语动词--to do 的用法
It's right to give up smoking // 主语
My job is to help patients // 表语 My job is help patients 对比
I want to leave // 宾语
He asked me to do the work //宾语补足语
I hope/demand/suggest you to come // 不能用 to do(特列)
I hope that you can come // 改为宾语从句或者 I hope you can come
I demand/ suggest that you should come
// to do 作定语：表示即将要发生的动作
He's finally made a decision to leave // 他最终做决定离开
I usually have a lot of meetings to attend in the evening = which I have to attend
The conference to take place in Shanghai next month is important = which will take place
1.n:
appeal, campaign.chance,courage,effort,evidence,opportunity,position,power,reason,right,skill,struggle,talent,way
// 作状语:
To catch the bus, we ran as fast as we could // 放在句首页
I came here to you
We turned to the lights off inrodor to waste elecity
// 结果状语
He left a rock only to drop it on his own feet
they queued for hours at the box office only to discover that tickets were sold out
// 原因状语
I was very excited to hear the news.
I could‘t but laugh
// 独立成分
to be frank / honest/ exact/ sure
to begin with/to tell you the truth
to say nothing of / needless ot say
to make a long story short
和疑问词 连用
I dont konw what to say
How to solve the problem is important
My question is when to start
// too.....to 太而不能
it is too difficult to understand // too.....to 太而不能
she was too surprised to see how angry her father was.// anxious/delighted/eager/glad/pleased/surprised/willing/king ==== 此时表示very
I saw him go out
He promised to write to me once a week
He pretend to be sleeping when i came in
they pretend to have finished the work
he is to blame
// 主动和被动的区别
I have so much work to do / to be done 我自己做主动 / 让别人做(不是我自己做)
Have you anything to send / to be sent
there is a lot of work to do / to be done
thers is nothing to do now / to be done
He's ready to shave/ to be done
He could do nothing but cry
why not have a rest
why bring that cup again?
来源：https://www.cnblogs.com/1018475062qq/p/7096494.html