1、(1)不定式做主语时,可以直接放在谓语动词之前。To see is to believe Not to get there in time is your fault.(2)注:常用it做形式主语,将to do位于之后,使句子保持平衡。句型1:It + 谓语 +(+sb.)+时间/金钱+ to do It takes us an hour _to_ get there by bus. It costs you only $ 100 a month to cook at home.It seemed impossible to save money.句型2:Its + n. (+ for sb)
2、 + to do Its our duty _to_ help the poor.It is a great enjoyment _to_ spend our holiday in the countryside. It is a great honor for us to be present at your birthday party.句型3: It is + adj (+ for sb) to do sth(是形容事物的性质的 )It is + adj (+ of sb) to do sth(是形容人的品质的 )It is easy for me to finish this work
3、 before ten. It is very kind of you to give me some help.Its impolite of you to speak to the teacher like that.疑问词+不定式 作主语When to start remains undecided.1. It is easy to get there by bus or taxi.2. It takes about 3 hours to see all the birds.3. It is also impolite to speak with your mouth full when
4、 you are eating.4. Its our duty to take good care of the old.5. How long did it take you to finish the work?6. It is stupid of you to write down everything the teacher says.7. When to start has not been decided.8. It seemed selfish of him not to give them anything.9. Its necessary for you to lock th
5、e car when you do not use it.10. It is useful for our health to do morning exercises.II.作宾语 接不定式做宾语I want to know this matter.I dont expect to meet you here(1)常见动词有:like, demand, expect, promise, begin, determine, refuse, fail, manage, learn, seem, forget, want, prepare, pretend, plan, wish等They wan
6、t to get_( get ) on the bus, didnt they? He said he wished _to be ( be ) a professor.(2)it作形式宾语I find/feel to work with him interesting I find/feel it interesting to work with himSubject+ find/think/feel/make/ consider it+adj/n + to do sth. 1.Wethought_it_better_to_startearly.2.Doyouconsidernot_to_g
7、o?3.Ifeel_it_mydutychangeallthat. 4.We think it _ important _ to _ obey the law.5.I know _ it _ impossible _ to _ finish so much homework in a day.(3)疑问词+不定式 作宾语常常放在这些动词的后面作宾语:tell, advise, show, teach, find out, decide, discuss, learn, explainHe taught us how to use the tool. No one could tell me w
8、here to get the book.The dictionary didnt tell the Frenchman how to pronounce the word.(4) 作介词but, except, besides的宾语。Cant choose but doCant help but do/have no choice to doDo nothing but doPractice:1. Would you like to go to Thailand? (would like to do sth.)2. The driver failed to see the other car
9、 in time. 3. I think it our duty to obey the laws.4. Do you know how to play football?5. I found it difficult to see him here.6. Here are some ideas about how to find cheap, fun things to do with your family on weekends.7. Many people like to go to a restaurant.8. I havent decided whether to go or s
10、tay. 9. Everyone wants to have a happy weekend.10. She hope Ill advise her which to choose.III.作宾语补足语1. Illgetsomeone_to_repairtherecorderforyou. 2. Whatcausedhimhismind?v.+ sb.+ to doadvise, allow, ask, beg, cause, expect, encourage, force, get, hate, invite , order, wish, want, warn, remind, promi
11、se, permit, persuade, request+ sb. to do注意:(1)在动词feel (一感),hear, listen to(二听),have, let, make(三使),notice, see, watch, observe, look at(五看)(即:吾看三室两厅一感觉)等后面的补足语中,不定式不带to,但变为被动语态后,必须带to。v.+ sb.+ do Lets go to Thailand right now. (let sb. do sth.)They saw the boy fall off the tree. (see sb. do sth.) Th
12、e boy was seen to fall off the tree.He is often heard to sing (sing) the song.Though he often made his deskmate cry (cry).Today he was made to cry(cry) by his deskmate. (make sb. do sth.)(2)help后面作宾语补足语的不定式可以带to,也可以不带to. I often help him(to)clean the room. help sb. (to) do sth.I helped him (to) find
13、 his things. 比较:The professor told the students how to do the experiment .The professor told the students to do the experiment.1. No one lets you sit in the office.2. I want you to know some rules.3. I heard her sing today. She sang wonderful.4. We watched the children play games.5. Do you feel the
14、house shake?6.The boss made the workers work for 12 hours a day. 7. We were made to make ten sentences with these words.8. Im waiting for Tom to give the answer.9. Would you like her sing a song for us?10. Did anyone notice a strange man come into the bank?IV作定语I have something to tell you. (不定式作定语)
15、1.被修饰词是不定式的逻辑主语She is always the last to leave the room.We need someone to help with the work.She is always the first to answer questions.2.不定式用来说明所修饰词的内容 I have no chance to go there.He made a promise to be a good boy.There is no need to build a dam on the small river. 3. 不定式与它所修饰的词有动宾关系 Do you hav
16、e anything to wash today? One of the most interesting places to visit in Singapore is Bird Park.不定式为不及物动词且和所修饰的名词是动宾关系时,须加介词 He bought a cup to drink water with. I have nothing to complain about.He is looking for a room to live in.1. Each member can choose a film for the evening to watch together.2.
17、 He sat down at a table and waited for someone to take his order.3.Is this the best way to help him?4. Please give me something to drink.5. She has a child to take care of.6. He is not the kind of man to do such things.7. It is already time to begin our class.8. Thank you for giving me the chance to
18、 make the speech.9. She bought a bookshelf to put her books on.10.You are the only person to be late.V.作状语 不定式作状语可以表示目的、原因、结果。I came here to see you(目的)We were very excited to hear the news(原因)He hurried to the school to find nobody there. (结果)(1)作目的状语 表示谓语动作的目的,其逻辑主语通常是句子的主语。强调动词不定式所表示的目的时,动词不定式可用
19、in order to +V. (原形)so as to +V. (原形)但so as to 不用于句首。The student saved much money to buy a new mobile phone.He got up early in order to/so as to catch the first bus.= In order to catch the first bus, he got up early.People have learnt the importance of keeping a balanced diet to satisfy (satisfy) th
20、eir nutritional needs.(2) 作结果状语不定式作结果状语时,多表示出乎意料的结果,其逻辑主语通常是句子的主语。作结果状语的不定式通常用一般式,为了表示强调可在不定式前加上only.I rushed to the station, only to find the train had already gone.We came home to find our garden neat and tidy.不定式作结果状语时,常用于soas to,suchas to, enough to, tooto,only to等结构中。如:She was so late to miss h
21、alf of the lecture.She is such a good teacher as to be repected by all her students.The house is large enough to hold two hundred people.The hat is too large to wear.He walks too slowly to get there on time.(3)作原因状语。 不定式与情感类形容词连用时,大多表示原因,用来作原因状语。这类形容词主要有: happy, kind, surprised, frightened, shocked,
22、 glad, delighted, dissapointed等。They were surprised to be informed of the news.She was very happy to hear that her son had been promoted.1.Im glad to show you around the zoo on such a beautiful day.2. When people are too tired to cook after work, they often get a “takeaway”.3. Tart apples are used t
23、o make apple sauce.4. One day he went to a cafeteria to have lunch.5. I am too tired to think of anything now.6.I work hard to pass the exam.7.You couldnt do that to save your life.8. The tea is too hot to drink.9. English is too difficult for me to learn.10. This question is too hard for me to answ
24、er. 作表语动词不定式往往放在连系动词be的后面作表语。(1)常说明主语的内容、性质、特征My wish is to become a teacher.Your job today is to clean the playground.To be kind to the enemy is to be cruel to yourself.My suggestion is to put off the meeting.(2)动词不定式作表语,表示将来They are to marry next week.You are to deliver these flowers before 10疑问词+
25、不定式 作表语The question is where to get the medicine.The difficulty is how to do the most of work with the least of money.Practice1. His dream is to be a doctor.2. The next step is to turn on the TV.3. The purpose of education is to develop a fine personality in children.4. Now my task is to finish the
26、composition.5. The question was how to do the job well.不定式的主动形式表示被动意义I have something important to do. In the accident, the driver was to blame.This question is difficult to answer. The box is not easy to carry. 动词不定式综合练习1.I want to give up this job but I have to support my family.2. It will be diff
27、icult to live like this after they take back the house next July.3. It took me 3 days to learn the English song.4. The passage tells you what to do in the first few minutes.5. Everyone should know how to call for help in their area.6. The teachers also help them to do these things.7. To be a winner,
28、 you need to give all you have and try your best.8. Which of them would you most like to visit?9. I feel it my duty to help others.10. The earth is better place to live on, but scientists are trying to make the best use of the moon.11. The birthday child wears new clothes to mark the special time.12
29、. A flag is flown outside a window to show that someone who lives in that house is having a birthday.13. The best way to improve your English is to join an English club.14. Something is still to find out.16. How to make requests politely is important.17. You must be patient and persistent if you are to succeed.18. I
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