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不定式

作用：简化句子

溯源：英语一主一谓原则 => 一个句子只能有一个谓语动词

能干什么=>语法功能

长什么样=>各种形式

动作发出者=>逻辑主语

作用：简化句子(定语从句）

He is the best man who can do the job.
He is the best man to do the job.
I don’t know what I should do.
I don’t know what to do.

能干什么=> 不定（infinite无限，除了谓语）=>

主语：

To see is to believe.
To save time is to lengthen life.
To watch/watching movie is fun.
To watch movies in a luxurious cinema is fun.
不定式经常在句尾做主语（主语短语太长）
It is fun to watch movies in a luxurious cinema.
It is adj (for/of sb) to do…
It is hard for us to master English in a short time.

宾语： V + to do

宾语补主语（v + sb + to do）：

My mom allows me to play PS5 only on holidays.

定语（名词代词后+to do）：

Something to eat.
Something to drink.
To be a men is to have a story to tell.
A good place to sell stuff.
A good place to settle down.
He is the best man who can do the job.
He is the best man to do the job.
The next train which is to arrive is from NY.
The next train to arrive is from NY.

状语

目的状语：

To learn English well, I have come to New Oriental School.
We eat to live, not live to eat.
To keep earning, keep learning.

结果状语：

We hurried to the railway station, only to find that the train had just left.

原因状语：

It is nice to meet you.
I am glad/delighted/surprised to do…

独立成分：

To begin/ start with
To tell you the truth
To make a long story short.
To be honest/frank/exact
To say nothing of 姑且不说

长什么样=>各种形式

动词do各种形式

四种体态	主动	被动
一般	do	be done
完成	have done	have been done
进行	be doing	X
完成进行	have been doing	X

不定式的各种形式

四种体态	主动	被动
一般	to do	to be done
完成	to have done	to have been done
进行	to be doing	X
完成进行	to have been doing	X

动作发出者=>逻辑主语

It is adj (for/of sb) to do…
It is important (for you) to go there.
He was very willing(for you) to come.

作用：简化句子(定语从句）
能干什么=> 不定（infinite无限，除了谓语）=>
长什么样=>各种形式
- 动词do各种形式
- 不定式的各种形式
动作发出者=>逻辑主语