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课件网) Unit 2 I’ll help to clean up the city parks. Section A Grammar Focus-4c 学习目标 通过本节课的学习，同学们将能: 1.对动词不定式的用法进行归纳和总结，掌握其规则，熟练运用本单元出现的词组及动词不定式。 2.通过志愿者行动计划，乐于助人的优良 品质。 I’d like to help homeless people. She decided to try out for a volunteer after-school reading program. You could ask hospitals to let you visit the kids and cheer them up. Mario believes it can help him to get his future dream job. She volunteers there once a week to help kids learn to read. I’m making some signs to put up around the school. 作宾语：主语+谓语V. + to do 作宾补：主语+谓语V.+sb.+ to 作目的状语 Grammar Focus 语法概述 动词不定式的基本形式是“to+动词原形”，有时to可以省略。否定形式为not to do。动词不定式在句中可以作主语、宾语、表语、定语和状语，还可用在复合结构中。 动词不定式结构 用法1 作主语 动词不定式的用法 用法2 作定语 动词不定式作主语时,常用it作形式主语,而把作真正主语的动词不定式放在句尾。 It is difficult to finish the work in an hour. 在一个小时内完成这项工作是困难的。 动词不定式作定语,要放在它所修饰的名词或代词之后。 Would you like something to eat 你想吃点什么吗 用法3 作宾语 (1)refuse,decide,hope,agree,choose,wish,learn,want等动词后常接动词不定式作宾语。 Lily wants to find a job as an English teacher in Beijing.莉莉想在北京找一份英语老师的工作。 He decided to help the homeless.他决定帮助无家可归的人。 ◆常接动词不定式作宾语的动词有： 想要拒绝忘记(want，refuse，forget) 需要努力学习(need，try，learn) 选择同意帮助(choose，agree，help) 希望决定开始(hope/wish/expect，decide，begin/start) (2)动词不定式可以和what,which,how,where,when等连用,构成“特殊疑问词+动词不定式”结构,可在句中作主语、宾语、宾语补足语等。 How to get there is a problem.如何到达那里是一个问题。 （作主语） I don’t know what to say.我不知道说什么。（作宾语） He taught himself how to use the computer.他自学了如何使用电脑。（作宾语补足语） 动词不定式作宾语补足语，也是在一些特定的动词之后，常见的接动词不定式作宾语补足语的动词有： (1)ask/like/tell/want/...+sb.+to do sth. (2)let/have/make/feel/hear/see/watch/...+sb.+do sth.（此处省略了to） (3)help sb.(to) do sth.(动词不定式to可带,也可省略) 用法4 作宾语补足语 用法5 作表语 His dream is to be a doctor.他的梦想是成为一名医生。 用法6 作状语 （1）作目的状语 强调动词不定式所表示的目的时，动词不定式可用in order to或so as to +动词原形，so as to不用于句首。 The bus stopped so as to pick up passengers.这辆公交车停下来接乘客。 （2）作结果状语 The boy is old enough to look after himself.这个男孩足够大,可以照顾他自己了。 Exercise. 一、单项选择 1.I always tell my students _____ on the road because it’s really dangerous. A.not to play B.to not play C.not playing D.not play 2.—I will go to Harbin for my summer vacation.What about you —I haven’t decided where _____. A.Go B.went C.going D.to go A D 3.—I didn’t hear you come in just now. —That’s good.We tried _____any noise，for you were sleeping. A.not make B.not to make C.to mak ... ...
