1、Unit 4 Dont eat in class.,语法精讲,基础自测,阅读提升,第2课时 Section A (Grammar Focus3c),一、祈使句 1含义：祈使句是用来表示请求、命令或建议等的一种句型。其主语一般为第二人称you，但通常省略。祈使句的句末一般用句号，表示较强语气时用感叹号。为了使祈使句显得更委婉、有礼貌，可在开头或结尾加上please。,2祈使句的五种类型,3.祈使句的否定形式 通常是在谓语动词前加dont。但要注意以let开头的祈使句，其否定形式是 “Dontlet宾语动词原形其他”或“Let宾语not动词原形其他”。 4对祈使句的基本回答： ( 1 )A：Tom
2、, take the box to Mr.Wus office. B：肯定回答Yes, I will. 否定回答Sorry, I cant carry it. ( 2 )A：Dont listen to music in class. B：No, I wont.(用于自己之前没做过，同时也表明自己今后也不会做时)或Sorry, I wont do it in future.(用于自己犯错，被别人禁止时),( 3 )A：Lets go out for a walk.(“Lets do sth.”常用于提出建议) B：肯定回答Thats a good idea.或That sounds good.
3、(直接表示赞同) 否定回答Oh, no.Its too hot.或Oh, no.Lets watch TV at home.(可用“No”作否定回答，并适当解释或提出自己的见解)祈使句一般要对方去做的动作是在将来发生。肯定回答时常用“Yes, I will”；否定回答时常用“No, I wont”等。will为“将要”之意，wont为will和not的缩写形式，为“将不；将不会”之意。,二、情态动词can与have to 1can能；会 ( 1 )表示做某事的能力，其否定式为cant。如： Can you speak English? 你会讲英语吗？ ( 2 ) 表示“允许；许可”。如： Yo
4、u can keep the book for a week. 这本书你可以借一周。 2have to必须；不得不 其后接动词原形。have to有第三人称单数形式，即has to，变疑问句和否定句时要借用助动词do/does。如：We have to go home after school. 我们放学后必须回家。,.用括号内所给单词的适当形式填空。 1_(not play) with fire(火) 2Dont _(run) in the classroom. 3Let himnot_(not play) the computer games. 4Can we _(eat) here? 5
5、Do you have to _(go) to bed before ten at night?,Dont play,run,not play,eat,go,.根据汉语意思完成句子，每空一词。 1到这儿来。 _ _ 2别在走廊里跑。 _ _ in the hallways. 3快点！ _ _！ 4不要在这儿吃东西。 _ _ here. 5让我们骑自行车到那儿吧。 _ _ the bike to get there.,Come,Dont,Be,Dont,Lets,here,run,quick,eat,ride,.按要求完成下列句子，每空一词。 1Lily can play the guitar.
6、(改为一般疑问句并作否定回答) _ Lily _ the guitar? No , she _ 2Jack has to play the piano every weekend.(改为一般疑问句) _ Jack _ _ play the piano every weekend? 3Be quick.(改为否定句) _ _ quick. 4You cant eat food in class.(改为祈使句) _ _food in class. 5You cant be late for class next time.(改为祈使句) _ _ late for class next time.,
7、Can,Play,cant,Does,have,Dont,Dont,Dont,to,be,eat,be,.单项选择。 ( ) 1. _ listen to music in the classroom. ANot BNo CDont DDoesnt ( ) 2. Tom，please _ the classroom now. Aclean Bto clean Ccleans Dcleaning ( ) 3. Lets _ on time for classes. Abe Bbe not Care Dis,C,A,A,B,( ) 4. She has to _ her homework ever
8、y night. Adoes Bdo Cdoing Ddid ( ) 5. Sorry，you _ play basketball in the classroom. Acant Bdont Cdont have to Ddoesnt,A,Dear Sam， Here are some _1_ for you when your dad and I are not at home._2_， get home early.Dont play _3_ after school.Second，take care of(照顾) your brother and dont _4_ with him.Th
9、ird, help your grandma do the _5_ after dinner.,fight dirty dish rule before follow outside keep one practice,.选词填空。 阅读短文，从方框中选择适当的词并用其正确形式填空，使短文通顺、意思完整。每词限用一次。,Fourth，remember to _6_ the piano for one hour every evening.Fifth，go to bed _7_ 10 oclock.The last one, _8_ your room clean and dont leave your _9_ clothes everywhere.Your dad and I will be very happy if you can _10_ the rules.1_ 2_ 3_ 4_ 5_ 6_ 7_ 8_ 9_ 10_,rules,First,outside,fight,dishes,practice,before,keep,dirty,follow,
