一感觉”。例如：
Let's （to）go！走吧！ He saw the thief （to）steal a lady’s cellphone.
注：改为被动句时要把to还原，例如：
The thief was seentosteal a lady’s cellphone.
6．不定式的省略。下列短语中，如果意义明确，常常省略到to。
want to,wish to,hope to,like to,hate to,plan to,try to,love to,have to,ought to,need to,used to,be able to
7．不定式作定语，应注意两种关系：
1）动宾关系：
He has a lot of meeting to attend . Please lend me something to write with .
He is looking for a room to live He is looking for a room to live in . He has no money and no place to live ( in ) .
I think the best way to travel ( by ) is on foot .
There is no time to think ( about ) .
2）主谓关系：
She is always the last ( person) to speak at the meeting .
----I’m going to the post office,for I have a letter to post . ( 逻辑主语是I )
-------Thank you. But I have no letters to be posted now ( 逻辑主语不是I )
7．不定式作状语，可以有以下几种意义：
1）原因
He is lucky to get here on time . 这种结构中常用的形容词有：
happy,glad,delighted,pleased,sorry,eager,anxious
lucky,fortunate,proud,angry
.
surprised,frightened,disappointed,ready,clever,foolish,worthy
2) 目的
He came to help me with my maths .
3) 结果
I hurried to get there only to find him out .
The book is too hard for the boy to read .
He is old enough to go to school . 8 .不定式作补足语
I saw him play in the street just now .
能跟不带to 的不定式作补足语