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1、动词不定式,定义：不定式的构成是to+动词原形，当然to有时也可以省略。动词不定式没有人称和数的变化，可以担当除谓语外的任何句子成分。,构成：to + do(动词原形),（1）基本形式： to+动词原形 （在某些情况下可以不带 to）,动词不定式,C.有动词特点，有自己的宾语和状语,用法：1、用作宾语 (v. + to do ) e.g: I want to buy a computer. She hopes to find a better job. I wish to go with you. I found it difficult to fall asleep.我发现很难入睡。 nee
2、d to do learn to do agree to do stop to do plan to do decide to do go on to do try to do begin to do start to do refuse to do like to do forget to do remember to do,动词不定式做主语时常用it作形式主语，把真正主语放后面。若要说明动作是谁做的，可在不定式前加for引导的短语；但若表语是kind.nice.right.wrong.clever.polite.rude.careful等描述行为者的性格、品质的形容词，则应在其前加一个of
3、引导的名词或代词短语加以说明，或称赞或责备批评。 Its very nice of you to help me.你能帮助我真是太好了。 Its necessary for the students to do eye-exercises twice a day.对学生来说一天做两次眼保健操是重要的。,A、作主语，如,To learn a foreign language is not easy .,It is good others. 帮助他人是件好事。 It is exciting the Internet. 上网是件令人兴奋的事。,to help,to surf,= Its not ea
4、sy to learn a foreign language.,动词不定式用法,B 作宾语,动词 + to do 常见动词有 start,like,forget,learn,agree, decide , fail, hope, wish , want, plan 等,1 He decided (buy) the camera.,to buy,2 I want (listen to) some music after class.,to listen to,3 I hope (travel) all over the world one day.,to travel,动词不定式,C、作表语，如
5、,The important thing is to finish the work on time .,What you have to do now is (打扫教室),to clean the classroom,动词不定式,6.用作定语,Give me something to drink.,I have two books to read.,They have much food to eat.,（这时不定式与被修饰词有动宾关系。 若是不及物动词，介词不能省略）,He asked for a room to live in.,I dont have a pen to write wi
6、th.,The ice is hard enough to skate on.,He bought a toy to play with.,3. 用作状语(adverbial)：,He came to show me his new CD player. I went there to see my teacher. She came back to get her English book. The boy was too frightened to move.,(目的),(目的),(目的),（结果）,2. 用作宾语补足语：(v. + sb. + to do ),She asked me t
7、o help her. The teacher told him to come on time. Edisons mother taught him to read and write. want sb to do wish sb to do get sb to do order sb to do find sb to be like sb to do would like sb to do help sb to do,too.to 太 . 以致于不能. enough to 足以. The box is too heavy for me to lift. 这个箱子太沉了，我提不动。 He i
8、s old enough to go to school. 他到上学的年龄了。,特殊用法,2) 动词+疑问词 + to do,I dont know what to do . how to do it/that. (去哪里) (什么时候出发) (选择哪个),Where to go,When to leave,Which one to choose,动词不定式,动词不定式作宾语时，若其后面有宾补，常用 it作形式宾语，而把真正宾语放在宾补后面 句型： 主语+谓语+it+宾语补足语+动词不定式（短语）。,3) 动词 + it(形式宾语）+宾补 +to do,I find it important
9、to learn English,我发现很难和他好好相处. 我发现在温暖的春天很容易入睡,I find it hard to get on well with him .,I find it easy to fall asleep in warm spring.,动词不定式,1) 动词 + 宾语 +to do,Li Mei asked me to show her the new dictionary .,注：有以上结构的常用动词有 tell. wish, ask, want like, beg, invite,warn, allow,encourage,advise 等。,2) 动词 + 宾
10、语 + do,(不带 to 的不定式),注：常用的动词是:感官动词see, hear, feel, watch； 使役动词 have ,make, let.另外在had better后也不带to,动词不定式做宾补,Her mother makes her do her homework erery evening.她妈妈让她每天晚上做作业。 Youd better not go out now.你最好不要现在出去。,E、作状语,可以表目的、表结果、表原因,F、作定语（修饰名词，必须后置）,I came here ( 告诉你一个好消息),to tell you a good news,We ha
11、ve a lot of homework to do every day.,I have a good news to tell you.,我们每天有很多作业要做.,我有个好消息要告诉你.,动词不定式,He is very glad to meet you(见到你他很高兴),not + to do,Mr.Smith asked the boy _(not play) this kind of game.,not to play,Please tell her _(not do) so much housework.,not to do,返回主页,动词不定式的否定形式,一、常使用动词不定式的短语
12、 1、Its time to do sth. Its time for sth 该作某事的时候了. 2、cant wait to do sth. 迫不及待要作某事 3、ask /telle sb. (not ) to do sth. 要求/告诉某人(不)作某事 4、allow sb. to do sth. 允许某人作某事 5、Would like /want (sb.) to do sth. 想要作某事,中考重点句型,7、have sth/nothing to do 有时要做/与无关 8、find it +adj. to do sth. 发觉作某事 9、prefer to do sth. ra
13、ther than do sth. 宁愿作某事,而不愿作某事 10、Its +adj. for sb. to do sth. 作某事对某人来说 11、Its better /best to do sth. 最好做某事 12、It takes sb. sometime. to do sth. 某人做某事用了一些时间,中考重点句型,1、一看二听三使役 see/ hear/ feel/ notice/ look at /listen to sb. do sth. 看见/听见/感觉/注意某人作某事 make /let /have sb. do sth. 使/让某人做某事 2、help sb. (to)
14、 do sth/ with sth.帮助某人作某事 3、 had better (not) do sth. 最好(不)做某事 4、 Why dont you/ not do sth.为什么不作某事 5、Would /Will / Could you please (not) do sth. 请你(不)作某事好吗?,省略动词不定式的短语,1、 stop to do sth. 停下正在做的事去作另一件事 stop doing sth. 停止正在作的事 eg. When the teacher came into the classroom, the students stopped talking
15、. After he worked for an hour, he stopped to have a rest. 2、 forget / remember to do sth. 忘记/记得要去作某事 forget / remember doing sth. 忘记记得曾经做过某事 eg. Please remember to bring my book to school. I remember doing my homework,同义词比较,3、 used to do sth. 过去常常作某事 be used to do sth. 被用来作某事 be used to doing sth. 习
16、惯于作某事 eg. My father used to smoke. Wood is used to make paper. I am used to getting up early.,同义词比较,5、 tooto do sth. 太而不能 so +adj. /adv + that(从句) 如此以致 such +（a/an +adj.）+n.+ that(从句) 如此以致 (not) enough (for sb.) to do sth. (对某人来说)做某事(不)够 eg. The boy is too young to go to school. The boy is so young that he cant go to school. He is such
