（二）变成动词to do不定式形式：
（1）在一些动词want, like, wish, prefer, hope, try, begin, start, promise, forget后面：
I want to buy a computer. He prefers to stay at home. I forgot to tell you the news.
（2）用在某些tell sb. to do sth; sb. find it +adj to do sth; It is (was) +adj+ to do sth句型中：
Please tell him to come to my office. I find it difficult to learn English well.
It is very important for us to learn computer.
（3）主语+be+ adj. + to do sth：
I am glad to hear the good news. I am not able to finish the work on time.
（4）放在名词或代词后面：
Do you have anything special to tell me? I have much work to do this afternoon.
He was the first student to answer my question.
（5）：主语+be+ to do sth：
We’re to be married in May. At what time am I to come? How am I to pay my debts?
His wish is to become a teacher. It is for you to decide.
（6）在一些感官动词后面 (see, watch, feel, hear, find, smell) (省略了to)：
Did you see/ notice anyone leave the house? We felt the house shake.
I once heard her sing the part of Aida. What makes you think so?
（三）变成done过去分词形式：
（1）用于完成时态have (has) + done; had + done中：
I have just finished my homework. He told me that he had ever written a book.
（2）用于一些句型have (get, want, make) sth. done; 中：
I will have my eyes checked tomorrow. Can we have/ get the program changed?
We want the work finished by Saturday. You must make your views known.
（3）用于be + done被动语态中：
The lab is cleaned by the students every day. The glass was broken by the boy yesterday.
I will be given a job soon. The work has been finished. A letter is being written now.
（4）用于名词后面作定语中：
I have a book written by Lu Xun. He has many photos taken in Beijing.
（5）用于一些连系动词 (get, become, grow, look, keep, seem) 中：
When he heard the news, he got very excited. I have got used to this kind of life.
The room soon became crowded. After it, American movies became known worldwide.
He grew excited and a little nervous. Soon we grew dissatisfied with our work.
She looked shocked. They looked a little surprised when they came in.
He kept his mouth tightly closed. We must keep the documents looked up.
He seemed embarrassed by the question. No one seemed inclined to believe it.
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