动词不定式有进行体和完成体(如上to be writing，to have written)，也有被动态(如to be written)，所有的主动词，不论是及物动词还是不及物动词，也不论是动作动词还是状态动词，都有不定式形式。助动词除be和have外，没有不定式形式。动词不定式在语法功能上可作主语、宾语、表语、定语和状语。
1.Te get contact with his family in Taiwan made him extremely happy since they separated more than 40 years ago．
2.To finish that task in such a short time is really a challenge．
1.It made him extremely happy to get contact with his family in Taiwan since they separated more than 40 years ago．
2.John admitted that it is always difficult for him to be on time．
不定式结构所表示的动作是谁做的，即不定式的逻辑主语，通常可以通过for sb.to do sth.结构表达：
1.It is quite important for us to read good books during a general review．
2.It is not difficult fot those talented students to pass the exam.
1.It is very kind of you to tell me the truth．
2.It is stupid of him to do such a silly thing．
1.He managed to solve the complicated problem.
2.The stranger offered to show me the way.
3.Mr.Smith undertook to build a new plant in South Africa.
1.He does not know when to start.
2.You can decide whether to continue or to stop.
3.I will show you how to deal with it.
1.She considers it necessary to make friends with him.
2.We find it difficult to finish all the homework before 9 o’clock.
1.To see is to believe.
2.To work means to earn a living．
1.His aim is to study abroad in the near future．
2.The most important thing is to negotiate with them about the price．
3.What I want to say is to forget all the unhappy experience．
1.There was really nothing to fear．
2.He gave me an interesting book to read．
1.Mary needs a friend to play with．
2.That girl has nothing to worry about．
3.They have a strict teacher to listen to．
4.Although the film had been on for ten minutes，I still was not able to find a chair to sit on．
1.Have you got a key to unlock the door?
2.The action to be taken is correct．
3.There is nothing to be gained by pretending．
1.Her daughter will make an even bigger effort to please her．
2.I have no wishto quarrel withyou．
3.Neither of them had any inclination to do business with Mary.
1.They are quite surprised to see the great changes taking place in the area．
2.They are quite surprised because they see the great changes taking place in the area．
3.He was lucky to arrive before dark．
4.He was lucky because he arrived before dark．
1.She raised her voice to be heared better．
2.She raised her voice so that she could heard better．
3.We went via Heidelberg to miss the traffic jam．
4.We went via Heidelberg so that we could miss the traffic jam．
1.The French football team played so successfully as to defeat the Brazilians．
2.The French football team played so successfully that they even defeated the Brazilians．
3.He got to the station only to be told the train had gone．
4.He got to the station and was told that the train had gone．
1.I often heard him say that he would study hard．
2.I must have him see his own mistakes．
1.He was often heard to say that he would study hard．
2.After he had finished speaking，he was made to answer innumerable questions．
1.Help the old lady(to)carry the heavy box.
4)在had better，would rather，may／might as well，rather than，can not but等搭配之后初中英语语法总结，动词不定式也不带to。例如：
1.Unless you feel to ill to go out，I would rather not stay at home tonight．
2.She could not but criticize his foolish behaviour.
5)在make do，make believe，let drop，1et fall，1et fly，let slip，let drive，let go off，hear say，hear tell，leave go of等固定搭配中，用不带to的动词不定式。例如：
1.They let go of the rope．他们松开了绳子。
2.John let fly a torrent of abuse at me．约翰朝我痛骂了一顿。
3.I've heard tell of him．我听说过他。
4.Some of the faculty were let go for lack of the students．由于生源不足，一些教职员工被解雇了。
1.He will do anything except work on the farm．
2.There was nothing left for the enemy to do but surrender．
3.The spy was both hungry and cold；there was nothing left for him but to give in．
4.I had no choice but to wait till it stopped raining．
can not help but，can not choose but，can not but，do nothing but，have nothing to do but。例如：I can not but admire his courage.
I did nothing but watch TV last night．
I have no choice but to give up my idea.
7)紧跟在why或why not之后的动词不定式总是不带to。但是，紧跟在who，what，which，whether等连接词后的不定式带to。例如：Why stand up if you can sit down?
Why not ask your teacher when you don't understand the meaning?
You needn't decide yet whether to study arts or science．
1)构成完成式：to+have done进行式：to+be doing
1.She feels relaxed to have finished writing her thesis before the deadline．
2.The Vikings are believed to have discovered America．
3.When you called me last night，I happened to be working on the computer．
1.For twelve years，Spanish censorship did not allow Lorca's name to be mentioned and his work to be published．
2.The snow was supposed to have been blown off the mountain．
1.I decided not to ask him again．
2.Please remember not to leave the lights on when you are out．
1.______the seeds and they will grow.
A.Water B.To water C.Watering D.Watered
2.The purpose of the scheme is not to help the employers but______work for young people.
A.provide B.to provide C.providing D.provided
3.He arrived at the office early,______a good example to the others.
A.set B.to set C.to be set D.having set
4.Please make my excuse at tomorrow’s meeting—I’ve got too much work______.
A.to do to come B.doing coming C.to do coming D.to do coming
5.We looked everywhere for the keys,but they are nowhere_____
A.to find B.to have found C.to be found D.being found
6.After describing the planned improvements,she went on______how much they would cost.
A.to explain B.explaining C.to be explaining D.having explained
7.To test eggs,______them in a bowl of water:if they float they’re bad,if they sink they’re good.
A.put B.putting C.to put D.to be putting
8.Please remember______the plants while I’m away.
A.watering B.to be watering C.to water D.being watering
9.______wine,first you must press the grapes.
A.Making B.To make C.To be making D.Make
10.I’ve never been so poor______able to afford a meal.
A.as to be not B.not as to be C.as not to be D.as to not be
11.I don’t know whether to stay in teaching or____another job.
A.trying getting B.to try to get C.trying to get D.try get
12.I’ll have to change my clothes before I go out—I don’twant______like this.
A.to see B.to be seeing C.to be seen D.being seen
13.In fact,she was the first woman______to such a post.
A.to elect B.to be electing C.to have elected D.to have been elected
14.I’d like___over the Alps and looking down at the mountains.
A.flying B.being flying C.to be flying D.be flying
15.I’m learning______a cake.Can you explain______one?
A.to make,to make B.how to make,to make C.to learn,how to make D.making,making
16.Whom would you rather_____with you,Jim or Jack?
A.have go B.have to go C.have gone D.has to go
17.The husband advised______to the south,but his wife advised him_____up the idea.
A.moving,giving B.to move,to give C.moving,to give D.to move,giving
18.“Would you like to come for a walk with me?”“I’d prefer___,thank you.”
A.not to B.to not C.not D.can’t
19.I would mend your radio,but I don’t know______.
A.how B.to C.how to D.to how
20.“I haven’t heard from Henry for a long time.”“What do you suppose______to him?”
A.was happening B.to happen C.has happened D.had happened
21.When I handed the report to John,he said that George wasthe person_____.
A.to send B.for sending it C.to send it to D.for sending it to
22.“Do you know the girl in red?”“She seems_____me at last month’s party.But I’m not sure.
A.to introduce to B.to be introduced to C.being introduced to D.to have been introduced to
23.We all agreed______for another day,but Jim disagreed____
A.to wait,to do so B.to wait,不填 C.waiting,doing so D.waiting,不填
24.He made up his mind to devote his life_____pollution_____happily.
A.to prevent,to live B.to prevent,from living C.to preventing,to live D.to preventing,from living
25.I wish I’d been there—I would like____her face when his husband came in.
A.to see B.to have seen C.seeing D.having seen