江苏省常州市西夏墅中学九年级英语上册Unit5Grammar学案牛津版

1、牛津英语 9A 第五单元语法（ 2）学案学习目标： 1.should 和 ought to与 must 区别2.must与 have to3.had better4.Why not ?/Why dont you?1.should和 ought to与 must 区别用 should/ought to可以表示“劝说”或“督促”，和 must 一样，但三者语气强弱不同。用 should 语气比较肯定一些， 说话人的主观信心要强烈一些。含有责任的意思。用 ought to 则口气上不那么坚定。用 must 则在口气上最 强烈， 含有责任的意思。例如：You must do your homework

2、. You should speak to your parents politely.I ought to write to him today.2.must 与 have tomust 表示“必须”，侧重于说话人的主观意志。have to表示“必须”， 侧重于客观的需要，含有“不得不”的意味。3.had better (常缩写为d better)，是一固定词组，表示“最好”，用于表示对别人的劝告、建议或表示一种愿望。had better后面加动词原形，即had better do sth.不论主语 是第几人称 ,句子无论是何种时态，ha d better形式不变。 had better的否

3、定形式为 had betternot do sth表示“最好不要做”。如： Youd better not miss the last bus.Youd better not play on the road. Its dangerous.Youd better put on the coat. Its cold outside.4. Why not?/Why dont you?这两种句型结构常用于说话人向对方提出一个建议，意思是“不？”；“为什么不？”Why not?/ Why don t you? 后面必须跟动词原形。如：Why not go swimming?=Why don t you

4、 go swimming?Why dont you go out for a walk? =Why not go out for a walk?练习 ：一单项选择1.My mother was ill. I _ stay at home to look after her.A.mustB. have toC. couldD. can2.-_go shopping withyour father?-That s a good idea.A.Why dontB. Why notC. DoD. Does3.You _ give up smoking.A. would betterB. had bet

5、terC. would better to D. had better to4.Whydontyou_climbingwithustomorrow?A. to goB. goingC. goD. goes5.Cars, buses and bikes _ stop when the traffic lights changes to red.A. canB. mayC. mustD. need6.It s too hot. Perhaps you _ swimming thisaf ternoon.A.mustgoB. should goC. may goD. can go7.Tomakeou

6、rhometown more beautiful,you_throw rubbishintothe river.A. needn tB. mustntC. mustD. need用心爱心专心18.How interesting the news is! Why _ join us?A.wontB. noC. dontD. not二、完成句子1.You look so tired. _(你最好不要学习得太晚 ).2.We_( 我们应该每天保持教室整洁和干净).3._ (或许我们可以向朱老师求助 ). He is kind and helpful.4._(你为什么不出去啊？ ) You shoul

7、d not study all the time.5._(你得保持安静 ) while reading in the library.三、分别用 should, ought to, had better, have to和 must 完成句子1.Wash your hands before dinner.2.Make a wish when you blow out the candles on a birthday cake.3.Drink cold water taken directly from the fridge.4.Keep the table clean.5.Eat vegetables even if you do not like them.四、用 why not 和 ,why don t you分别完成下列各句。1.Go shopping with me.2.Ask your family to turn off