八年级下Unit2periodthree.doc

Unit2 Ill help to clean up the city parks.Period three Section A 4a-4cDate: Grade: Name:What to learn1. 重点词汇词汇及短语动词的用法。2. 能够了解并掌握动词不定式的用法。How to learn独立思考；合作探究lets learn Task one 语法精析：动词不定式动词不定式是由“to+动词原形”构成（有时可以不带to）。其否定形式是“not+动词不定式”动词不定式的句法功能非常广泛，在句中可作主语、宾语、补足语、表语、定语及状语等成分。一、作主语（1）动词不定式做主语时，谓语动词常常用单数。例如：To sweep the floor is my duty every day.每天打扫地板是我的责任。（2）如果动词不定式太长，常常用it作形式主语，而将正正的主语动词不定式后置。例如： its important for us to learn English well.二、作宾语（1）能够接动词不定式作宾语的动词有ask, agree, decide,fail, hope, manage, offer, plan, pretend, refuse, wish及would like/love等动词。例如I hope to visit this place again.(2)动词不定式与名词等词构成复合宾语时，通常要用it作形式宾语，而将真正的宾语动词不定式后置。例如：I found it difficult to see him here.三、作补足语某些动词在主动式中后接动词不定式作宾语补足语。这类动词常用的有consider, expect, tell, want, warn, wish, invite等。例如： They told him not to be late again.四、作状语动词不定式作状语可表示目的、原因及结果等。例如：Come to see me again soon.五、作表语动词不定式往往放在系动词be的后面作表语。例如：My wish is to become a teacher六、作定语动词不定式常常放在名词或不定代词后面作后置定语。例如：Do you have anything to do tonight?七、和疑问词连用不定式前可用 what, who, which, where, when, how, why等疑问词构成不定式短语。例如：when to start has not been decided. Do you know how to play football?Task two【合作探究】(一）朗读并翻译Grammar Focus 里的句子，找出句子中的不定式，并说出他们属于哪一种用法。（二）用表格中的短语动词填空，完成4a。（三）用方框中所给单词的正确形式填空，完成4b,朗读短文，勾画出其中的重点短语。（四）语言学习。1.For example , we can make plans to visit sick children in the hospital or raise money for homeless people. 例如， 我们可以制定一些计划去看望医院生病的孩子们或者无家可归的人们筹钱。【解析】 home n. 家homeless adj. 无家可归的 a homeless boy 一个无家可归的男孩We have only one Earth. Its our common _.A. family B. house C. home D. room【拓展】由home构成的合成词： homeland n 祖国 hometown n 家乡 homework 家庭作业homeless adj. 无家可归的 home-made adj. 自制的careless 粗心的 hopeless 没有希望的 helpless 无助的 useless 没有用的练习：You should do something to help _(无家可归的)people.2.Some people even stop doing their jobs for a few months to a year to move to another country, like Africa,and help people there. 有些人甚至会停下自己的工作几个月到一年去其他的国家，像非洲，并且帮助那里的人们。【解析】 stop doing(1) stop doing sth. 停止做某事 Please stop speaking.请停止讲话(2)stop to do sth. 停下来去做另外一件事 Please stop to talk.请停下来讲话(3)stop sb. from doing sth. =keep sb from doing sth=prevent sb from doing sth 阻止某人做某事(4)cant stop doing sth. 忍不住做( )Seeing their teacher _ into the classroom, they stopped _ at once. A. walk; tellingB. entering; to speak C. enter; to tell D. walking; talking( )Dad, why must I stop computer g