进行式 to be doing
完成式 to have done to have been done
1. 动词不定式的一般式：表示与主动词处于同一时间层面或动作发生于主动词之后。
eg: He seems to understand what I said
I hope to visit Paris again.
2. 动词不定式的进行式：表示与主动词同时发生且动作正在进行。
eg: The two cheats pretended to be working hard.
3. 动词不定式的完成式：表示不定式动作发生于主动词之前。
eg: She seems to have seen this film.
He happened to have gone out when I went to see him
4. 动词不定式的被动式：表示与逻辑主语之间的被动关系。
eg: The meeting to be held tomorrow is about how to stop the pollution.
I want to have been told the news earlier.
Ⅱ动词不定式的句法功能
不定式的句法功能是做主语，表语，宾语，宾语补足语，主语补足语，定语，目的状语和结果状语，分别给出一个例句 ：
1) To master a foreign language is necessary for a college student.
(主语)
2) Your job is to wash dishes.(表语)
3) She promised to give him a chance. (宾语)
4) The teacher told his students to pay attention to their pronunciation.(宾语补足语)
5) I was asked to help him with his lessons.(主语补足语)
6) Have you got a pencil to draw pictures with?(定语)
7) Some scientists went to Germany to attend a medical conference.(状语)
8) He was too excited to say anything.(状语)
Ⅲ 不定式的复合结构
1)“疑问词+不定式”可以做主语，宾语，表语，同位语。
The problem is how to persuade him to change his mind.
2) 带有逻辑主语的结构of/ for sb. to do sth
The first thing to do is to clean the room.
It is foolish of you to say such words.
辨析：⑴ It is + adj.+ of sb + to do sth.;// ⑵It is + adj.+ for sb + to do sth.
差别：以上(1)结构中的adj是用来说明主语的特征的，并作其表语; 而结构(2)中的adj是用来说明句中动词的特征的。
Eg: It’s foolish of you to do such things
可转化为：You’re foolish to do such things.
但:It’s easy for you to learn English well
不可以象上边那样转化。
Step 3 Practice.
Ex1.
Fill in the blanks with the verbs in their proper forms.
1. It's very kind of you ________ it for me. (do)
2.My job is ________ the students English. (teach)
3.If you want ________ with us, you should be ready by eight o'clock.(go)
4.I dare not ________ him about it. (tell)
5.He told me ________ at six thirty. (leave)
6.The children are warned ________ in that lake. (not swim)
7.Before you leave the room, please remember ________ the light. (turn off)
8.You'd better ________(stay) at home and ________ (do) your homework.
9.It's too hard ________ (do) it by myself. 10.It takes about two hours ________ (get to) the station.
11.It's time ________ our class. (start)
12.I have a lot of things ________ you. (tell)
13.I'm very glad ________ you again. (hear from)
14.The article is not easy ________ . (understand)
15.We didn't have time ________ a rest. (to have)
16.I'll try ________ that again. (not do)
17.John's wish is ________ a writer in the future. (become)
18.I'd like ________ (go) to the Summer Palace.
19.She doesn't know whether and when ________ Shanghai in two days. (leave)
20.She is not sure how ________ out the maths problem. (work)
Ex2
1. Don't forget _________ the letter.
A. to send B. send C. sending D. being sent
2. The chair looks very old, but in fact it is very comfortable to _________.
A. sit B. sit on C. be sat D. be sat on
3. Is ______ necessary to return the book tomorrow?
A. this B. that C. it D. which
4. I'm afraid they would not allow him ________ here.
A. to smoke B. smoking C. smokes D. smoke
5. Mother told me ________ the water before I drank it.
A. boiling B. boiled C. boil D. to boil
6. On my way home, I stopped _______ some food.
A. buy B. to buy C. buying D. bought
7. John was made _______ the car for a week as a punishment.
A. to wash B. washing C. wash D. to be washing
8. The sitting-room needs _______, but it'll have to wait until Saturday.
A. be cleaning B. to be cleaned C. clean D. being cleaned
9. The first thing I want to do is __________.
A. visit to him B. to visit him C. visiting him D. visited him
10. Li Yang advised me _________ too much, otherwise I would have been drunk.
A. not to drink B. to drink C. not drinking D. drinking
Can’t help but结构
区别：can’t help doing …禁不住…
Hearing that she was admitted to a famous college, she can’t help jumping.
1、不定式动词在介词but, except, besides等表示“除了……”之意的后面时，如果这些介词之前有行为动词do的各种形式，那么介词后的不定式不带to,否则带to。
She could do nothing but cry.
她只有哭泣。
Tom did nothing except wait before his parents came home.
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