八年级英语动词不定式用法梳理动词不定式是由“不定式符号to+动词原形”构成的一种非谓语动词结构。
有些动词不定式不带to，动词不定式可以作句子的主语、表语、宾语、定语、补语、状语或单独使用。
不定式保留动词的某些特性，可以有自己的宾语、状语等。
动词不定式和它后面的宾语、状语等一起构成短语，叫作不定式短语。
一、用作主语多数情况用it作形式主语，把真正的主语一一动词不定式置于句末，特别是不定式短语较长时。
动词不定式作主语，谓语动词用第三人称单数形式。
疑问词+不定式短语作主语可置于句首，复合不定式结构作主语常置于句末。
如：1.1 t is our duty to try our best to deal With these problems.2. The head teacher Said it WaS necessary to talk With his mother.3. HOW to learn EngIiSh well is important.4. To See iS to believe.（眼见为实；百闻不如一见）二、用作表语动词不定式作表语，常说明主语的内容、性质、特征。
如：1. The best Way is to join an EngIiSh club.2. The first thing is to IiSten to the teacher carefully.三、用作宾语1. 可以接带to的动词不定式作宾语的动词主要有：要求选择同意(ask, choose, agree)期望决定学习(expect, hope, decide, Iearm，宁可假装知道(prefer, pretend, know)，希望想要愿意(wish, want, would like / love)。
女口：1) We decided to talk to SOme StudentS about Why they go there.2) He PreferS to eat White bread and rice.3) Id love to ViSit Mexico.2. 动词decide, know, learn, show, teach, tell...，介词结构on...可用疑问词带to的不定式短语作宾语，但Why后面的不定式不带to。
女口：1) Could you PIeaSe tell me Where to Park my car?2) It gives advice on What to do in lots of different SitUations.3. 动词feel, find, make, think等后面，可以用it作形式宾语代替真正的宾语--- 动词不定式，句子结构是…feel / find / make / ... it+adj. / n.+to do...。
女口:4. 感知动词like, love, know等一般不用进行时态。
5. 后接动词不定式或Ving形式作宾语，意思差别较大的动词有forget, remember等。
后接不定式作宾语，表动作尚未发生；后接Ving形式作宾语，表动作已经发生。
stop to do停下来做另外一件事，to do是目的状语；stop doing停止做、不做当前这件事，doing是宾语。
try to do尽力做，try doing 试试看；go on to do接着做另外的事，go on doing继续做原来的事。
女口：1) When I Ieft home, I forgot to bring it With me.2) 1 StOPPed USing them last year.四、用作定语1•句子的主语或宾语是动词不定式的逻辑主语，不定式与其所修饰的名词、代词等存在逻辑的动宾关系.1) 1 have so many clothes to WaSh today.2) I Can ' t think of any good adv t cB giVe her.3) We have no houses to IiVe in.2. 动词不定式所修饰的名词是place, time, Way等时，不定式与这些名词呈现出动状关系或同位关系。
如如: 1)He needs time to do homework.2) He WantS to know the best Way to travel around the city.3. 在“ there be...”句型里，句子的主语是动词不定式动作的对象：1)There ' S just so much to See and do here.2)... but there are still many things to do the五、用作宾语补足语1. 带to的动词不定式作宾语补足语的动词主要有：要求允许提议(ask, allow, , advise)，期望邀请鼓励(expect, , invite, encourage)，教导告诉想要(teach, tell, Want)，等待希望愿意(Wait for, Wish, Would like / love)。
如：1)ld invite her to have dinner at my house.2 We should allow the ChiIdren to choose their OWn clothes.2. 动词不定式作补语，在主动语态句里不带to,被动语态句里带to时多数动词是感官动词和使役动词，包括四“看”：IOOk at, observe, see, WatCh三“让” ：have, let, make，二“听”：hear, listen to, —“感觉” ：feel, —“注意” ：notice。
女口：1) ThiS PiCture makes me feel excited ！2) We SaW LiU YU play baseball last week.3. help后接动词不定式作补语，to可带可不带。
1) they Can help you to learn English.2) USing email EngIiSh helps you Write quickly.六、用作状语1. 目的状语，置于句首或句末，置于句首时常表示强调。
女口:1) In order to CatCh the early bus, She got UP Very early.2) A group of young people got together to discuss this question.3) She Came to this City to ViSit her daughter.2. 原因状语，多见于“ sb.+be+adj .+to do…”结构句中。
女口：1) I feel Very lucky to have him.2) he ran out of money to buy old bikes.3. 结果状语，多见于“ too・・・to”，“enough to…”结构句中。
如：1) I ' m too tired to do it well.2) The room is big enough for three people to IiVe in.七、动词不定式的复合结构动词不定式的复合结构是“for / of sb. to do sth. ”，for / of弓I出不定式动作的逻辑主语。
这种结构在句子中可以作主语、宾语、表语、定语、状语等。
不定式复合结构的介词用for还是of，主要决定于前面形容词的性质。
一般说来，of前面的形容词是careful, clever, foolish, good, kind, nice, WiSe 等，既说明人的特性，又说明不定式动作的特性。
for前面的形容词是dangerous, difficult, easy, hard, heavy, important, interesting, necessary等，一般说明不定式动作的特性，前面如果是名词用for。
如：1.It ' S a good idea for ParentS to allow ChiIdren to StUdy in groups during the evening.2.It ' S WiSe of him to do it well.3) Is it interesting for the baby to play With a Pet dog?八、带疑问词的不定式短语动词不定式前面可以带疑问代词what, which, who或疑问副词how, when, where, Why等。
这种结构起名词的作用，在句子里用作宾语、主语、表语等，或者单独使用。
要注意的是，Why后面的不定式不带to。
如：1. 用作句子的成分。
1） 1 don ' t know What to try next.（作宾语）2） Where to go is not decided yet.（作主语） 2•单独使用时相当于一个特殊疑问句。
1） What to do next?（=What will We / you do next?2） Why go there?（=Why do We / you go there?九、动词不定式的否定式不定式的否定式是not / never to do...，不带to的不定式的否定式是not / never do...女口：1. They decide not to talk to each other.2. His ParentS tell him never to Play SOCCer in the street.随堂练习一动词填空。
1.1 ' moi ng to liste n to the radio. PIeaSe ______ （not talk）any more.2. The stude nts ___ （do）their homework from four to five this after noon.3. The StUdents __ （be）busy now. They ___ （have）an English exam next MOn day.4. Mary must ___ （look）after her little SiSter because She is too young.5. __ （he）you Waiting for a bus now ？6. ThiS coat is Very cheap. I ___ （take）it now.7.1 ' ll tell him about it When he ___ （COme）back.8. Could you tell me how.I ___ （Can get）to No 3 MiddIe school.9. He __ Said that the new teacher ____ （give）the StUde nts an En glish less on now.10. I ___ （milk）a cow three times.11. EdiSon ' S mother ___ teach）him herself.12. He ___ (WatCh) TV OnCe a week.13. DOn ' t SPeak loudly. The baby _____ (sleep).14. I WOn ' Ct gut Until.I ___ (finish) my homework.15. Could you tell me When the train ___ (arrive).16.1 often hear the sound of ChiIdren ___ (read) English in the room.17. He asked me ___ (help) him With his En glish this eve ning.18. Their work is ___ (clea n) the streets.19. Did he enjoy ____ (work) in Chi na.20. We will Stay at home if it ____ (rain) tomorrow.21. Be quiet ! The boy ____ (Sing) an English song.22. ____ you ______ y our homework yet (Start) ?23. Who ___ (teach) them English last term.24. There ____ (be) a telepho ne call for you just now.25. PIeaSe keep everythi ng __ (clea n).26. Peter won ' t have a rest Until he ____ finiSh) his work.27.1 WatChed TV , so I ___ (forget) ______ (do) my homework.28. When I ___ (walk) along the river , I met my friend , Tom.29. When MOther Came , the little girl ____ (play) With a cat.30. When I WaS five , I ____ (get) to know the earth ____ (move) aroUnd the sun.31. They _____ (See) a boy ____ (fall) in to the river while they ____ (PaSS) it yesterday.32. ____ (StUdy ) hard at your lessOnSand (not talk) in class.33. YOu ____ (have) better ______ (not eat) the bad food.34. While I __ (do ) my homework , my Parents _ (WatCh) TV.35. He ___ ( not finish ) ____ (read) the book.36.1 ___ (get) UP Very early this morning. I ____ (read) English now.37. He ___ (hurry) to school every morning.38. OUr teacher ____ (not stop ) ___ (work) Until eleven o ' clock last night.39. If he ____ (know) it , he _____ (be) Very happy.40. It ___ (take) US half an hour _____ (read) English every day.41. The ChiIdre n ___ (run) in the Street now.42. There ___ (be ) two meet ings tomorrow morni ng.43. My father ____ (sleep) When I ____ (get) UP this morning.44. When I ___ (go) to See Tom , he ______ (not Write ) anything.45. Sorry , When you ____ (call) me , I ______ (think) and ____ (not hear) you.46. Mr. Gree n ___ (leave) his no tebook at home yesterday.47. I ___ (Want) to buy a new coat next SUnday.48. HiS father____ (read) n ewspaper Whe n I got there.49. It ___ (be ) five years SinCe he ____ (buy) the motorbike.50. We found it WaS Very difficult ___ (get) a car.51. We are so glad _______ (hear) the n ews.52.1 S aW him _______ (GrOSS) the road SafeIy and ______ (run) away.53.You can ' t make him ________ (do) What you want. 54」don ' t know Where ________ (meet) him.55. What makes you _______ (think) I ' m a farmer?56. Did you See him _______ (go) upstairs?57.It is better _______ (PUt) your money in a bank.58.It is difficult for the boy _______ (SWim) across the river.59.I let him _______ (go) early as he Wan ted _______ (meet) his Un CIe at the StatiO n.60.Will you help me ________ (move) the bed?61」f he doesn' know, how _________ (USe) the recorder, you' dbetter _______ (ShOW) him.62.He is the last one _______ (IeaVe) the OffiCe every day.63」t ' S bad manners _______ (ShOUt) in public.64.The boy is old eno Ugh _______ (dress) himself.65.She is too ill ________ (go) to school.二选择题1. Tell him __ the Win dow.A. to close notB. not to closeC. to not closeD. not close2. Paul does n't have to be made _ . He always works hard.A. learnB. to learnC. IearnedD. Iearni ng3. You'd better ______ the story in JaPa nese.A. SayB. SPeakC. tellD. talk4. The Patie nt WaS Warned _ o ily food after the OPeratiO n.A. to eat notB. eati ng notC. not to eatD. not eati ng5. ——I usually go there by train.----Why not ___ by boat for a Cha nge?A. to try goingB. tryi ng to goC. to try and goD. trygoi ng6. There are some books On the floor, would you Iike _______ ?A. to PiCk them UPB. to PiCk UP themC. PiCk it UPD. PiCk UP it7. She is Very ill, let's ______ a doctor at on ce.A. to Wake UPB. Send forC. to Pay forD. Pay for8. I Want ______ a teacher Whe n I grow up.A. to beB. toC. beD. being9. It's cold here. Y ou'd better _____ your Coat.A. not take outB. not to take dow nC. not take offD. not to take away10. My mother told me ________ m ore water.A. drinkingB. dra nkC. to drinkD. dr ink。