初中英语人教版七年级下册unit4 grammar .doc

Unit 4 Dont eat in class Period 3教学目标：1.Reviews P1920 words. 2.掌握Grammar Focus. 3.学会祈使句；情态动词have to与must的用法.Guide one (5)Read aloud P1920 words and check them.Guide Two (10)1. Read Grammar Focus aloud and try to translate them into Chinese.2. Then recite Grammar Focus and check them .Guide Three (10)Master important and difficult points.1. Dont+V原+其他 即Dont do sth.不要做某事2. must+V原 即must do sth 必须做某事3. have/has to +V原 即：have to do sth 不得不做某事4. can/cant+V原 会（不会）做某事5. wear a hat 戴帽子 wear a uniform at school 穿校服6. be on time 按时/准时/守时 be in time 及时7. 祈使句（1） 定义：表达命令、请求、劝告、警告、禁止等的句子叫祈使句。（2） 祈使句的形式肯定祈使句Do型：行为动词原形+其他成分eg:Come here,please.Stop talking!Be型：Be+形容词/名词eg:Be quiet,please.Let型：let+宾语+V原+其他eg:Let me help you !否定祈使句形式1.Do型与Be型的否定形式都在句首加dont.eg:Dont eat in class!Dont be late for school!2.Let型否定形式：Dont+let+宾语+V原+其他/ Let+宾语+V原+其他.eg:Dont let him go./Let him not go.3. No+n.pl.V-ing!(即动名词）常用作标志语或说明。“严禁|不准|禁止做某事！Eg:（1）No smoking.不准吸烟。（2)No photos.不准拍照。 4. 情态动词have to与must辨析（1） have to标客观需要做的事情. “必须，不得不”.单三形式has to（2） 含有have to ,has to构成疑问句或否定句借助动词do或does。Eg:Do they have to go home now?You dont have to go if you dont want to.2. must 表(1)主观义务主要用于肯定句和疑问句。由must引导疑问句，肯定回答用must，否定回答用neednt。Eg:Must I finish my homework before six oclock?-Yes,you must./No,you neednt/No,you dont have to.(2)表示肯定的猜测，常用于肯定句“一定是，必然.”eg:You must be very tired.Guide Four 5Finish3a(write the rules for the school library)Guide Five 5Finish 3b(Use the words to make questions about the rules) Then write answers according to your school.Guide Six 10( )1.The doctor says to Tom， “_stay up too late.” A .Doesnt B .Cant C. Dont D.No( )2_ your homework here tomorrow,Lucy. A.Bring B.Brings C.To bring D.Bringing( )3.You dont _ wash all the plates after meals. A have to B must C may D has to( )4.Bob can