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1、动词不定式一定义1由“ to+动词原形”构成，是动词的一种非谓语形式，在句中作除谓语之外的其 他成分。 to 是不定式的标志，无词义。不定式 无人称和数的变化 ，2. 肯定形式 to do; 否定形式 not to do 。3. 不定式仍有动词的特点，即可以有自己的宾语和状语。 二功能：不定式有名词、形容词、副词的功能，在句中作主语、宾语、表语、 定语、宾语补足语和状语。就是不作谓语。1. 作主语（谓语动词使用三单形式 ） , 一般表示具体的某次动作。 直接放在句首To help each other is good. 用 it 作形式主语，而将作真正的主语（不定式）置于句末，如以下结构： I
2、t is easy/ hard/ difficult/important/necessary/interesting （for sb.） to do sth.It is important for us to learn English wel.lIt is our duty to do sth.It is our duty to keep our classroom clea. n注：-ing形式与不定式作主语之区别：-ing作主语，通常是某种经常性的活动，即泛指某种抽象的动作；不定式作主语， 通常表示某次具体的动作。2. 作宾语 常只跟 to do 作宾语的动词如下： hope, plan
3、, decide, expect, agree, choose, seem, happen, learn, teach, prepare, promise, wish, wait, fail, afford, manage, refuse, pretend, offer, arrange 等 即跟to do又跟-ing作宾语，意义差别不大的有：begin/start; continue; 即跟to do又跟-ing作宾语，且意义差别很大的有：remember, forget, mean, try, regret, stop, canthelp 等。略。 “疑问词 /whether to do
4、”作宾语。“疑问词 +不定式”作宾语 = 该疑问词引导的一个宾语从句I dont know how to finishthe work.=I don t know how I can finishthe work. 用 it 作形式宾语，将真正的宾语不定式放在最后。I find it difficult to learn English we.llI don t think it right to do it that way.3. 作表语 放在 be/ seem/ appear 等之后，表示主语的内容是将来的某次 （具体 ）的动作。 His dream isto be a doctor.4.
5、 作定语 放在其修饰的词之后， 表将来。 与被修饰的词有被动关系， 不定式必是及物动 词。I have a lot of homework to do.I have no pen to write with.Give me a piece of paper to write o.n 给我一张纸写字。 当被修饰的名词是 序数词（包括last, only, next）和最高级,或有序数词（包括last） 和最高级来修饰时，要用不定式作定语。Lucy is alwaysthe first to comeand the last to leave.The last one to arrivepays
6、the bill.I dontthink him to be the best man to do the jo.b 当名词为复合不定代词 somethi ng, any th in g等时，常用不定式作定语。Do you havesomething to sayfor yourself?There wasnothing to bring homethat morning. 那天早上（他回家时）两手空空。 不定式常作下列的名词定语： time, way, place, plan, chance, decision, promise, effort, 等。He needstime to do h
7、is homewor.kOur teacher had no time to think about res.tIs there a good place to hang ou?tThe old man is looking fora quiet place to live.I know the best way to go around the ci.ty5. 作宾语补足语 以下动词，后接宾语，再接to do作宾补语。tell, want, ask, teach, expect, invite, order, help, like, send, advise, choo,sbeeg, all
8、ow, encourage, force, wish, warn, hate 等。 构成 ask/tell sb. (not) to do sth. 以下动词，后接宾语，再接省to的不定式作宾补语。若变为被动语态，添上to。一感： feel二听： listen to, hear三让/使： let make, have五看： look at, see, watch, notice, observe半帮助： helpThe teacher made himsaythe word like this.老师让他像这样说这个单词。Could you help me (to) carry the heav
9、y box？你能帮我搬这个重箱子吗？The teacher made the two students standfor three hours.f The two stude nts were made to stand for three hours.6. 作状语作目的状语to do, in order to do,等，I come here onlyto say good-bye to you. 我来仅仅是向你告别。In order not to forge,tI have written it down.为了强调，把不定式放在句首To save the energ,yturn off
10、the hot water after you take s shower.To speak English we, lolne must have a lot of practice.作原因状语Im glad to see you agai.nI am sorry to hear your grandma isl.il 作结果状语He is to youngto go to schoo.lHe is old enoughto go to schoo.l7. 作插入语作插入语，为独立成分，位置活泼。但需与其它成分用逗号隔开。to be honest, to tell the truth, to
11、 begin with, to make matters worse, to be frank( 坦 率地说 )等。8. Its adj. for sb.to do sth. 和 Its adj.of sb.to do sth.1) Its adj. for sb.to do sth.做某事对某人来说如何如何。其中的形容词一般为描述事物的特征、特点，表示客观形式的形容词，如 easy, hard, difficult, interesting, impossible 等：例如：Its very hard for him to study two languages. 对他来说学两门外语是很难的
12、。= To study two languages is very hard for him2) Its adj.of sb.to do sth.某人做什么真的是怎样怎样。其中的形容词一般描述人的性格，品质，性情，表示主观感情或态度的形容词，如 good, kind, nice, clever, foolish, right 例如：Itsvery nice of you to help me. 你来帮助我，你真是太好了 .=You are very nice to help me9用作介词的to，后接doing.be used to习惯于;look forward to 期望;pay atte
13、ntion to 注意 ;preferto比起 更喜欢记住如下惯用法： Why not do had better (not) doYoud better give back the books to the library on time. would rather (not) do tha n do sth. 不定式在介词but, except后面时，若but等前面有实义动词do的任何形式时, 则后接不带to的不定式；否则带to.They did nothing but wait.He wants to do nothing but go_ out. 他只想出去玩。What do you
14、like to do besides swim 了游泳你还喜欢做什么？They had nothing to do but wait.=They had no choice but to wait.He wants to believe anything but to take the medicine. 除了吃这药，他什么都信。 prefer to sth. rather tha n do sth. used to do sth. will/would you please (not) do sth. do sth. to do sth.采取措施做 want to do sth.想做/want doing 想被 have somethi ng to do with 与有关
