初中英语不定式复习27445.pptVIP

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引导的名词或代词短语加以说明，或称赞或责备批评。 It’s very nice of you to help me.你能帮助我真是太好了。 It’s 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。 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）。 Her mother makes her do her homework erery evening.她妈妈让她每天晚上做作业。 You’d better not go out now.你最好不要现在出去。 * * 动词不定式 （1）基本形式： to+动词原形 （在某些情况下可以不带 to） （2）特点 ： A .没有人称和数的变化,不能单独做谓语 B . 可以作主语、宾语、表语、状语、宾语补足语 动词不定式 C.有动词特点，有自己的宾语和状语 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 = It’s not easy 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 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 2) 动词+疑问词 + to do I don’t 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 3) 动词 + it(形式宾语）+宾补 +to do I find it important 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