1、Unit 4 Dont eat in class Period 3教學目標：1.Reviews P1920 words. 2.掌握Grammar Focus. 3.學會祈使句；情態(tài)動詞have to與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

2、)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 必須做某事3. have/has to +V原 即：have to do sth 不得不做某事4. can/cant+V原 會（不會）做某事5. wear a hat 戴帽子 wear a uniform at school 穿校服6. be on time 按時/準時/守時 be in time 及時7. 祈使句（1） 定義：表達命令、請求、勸告、警告、禁止等的句子叫祈使句。（2） 祈使句的形式肯定祈使句

3、Do型：行為動詞原形+其他成分eg:Come here,please.Stop talking!Be型：Be+形容詞/名詞eg:Be quiet,please.Let型：let+賓語+V原+其他eg:Let me help you !否定祈使句形式1.Do型與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+賓語+V原+其他/ Let+賓語+V原+其他.eg:Dont let him go./Let him not go.3. No+n.pl.V-ing!(即動名詞）常用作標志語

4、或說明?！皣澜鹼不準|禁止做某事！Eg:（1）No smoking.不準吸煙。（2)No photos.不準拍照。 4. 情態(tài)動詞have to與must辨析（1） have to標客觀需要做的事情. “必須，不得不”.單三形式has to（2） 含有have to ,has to構成疑問句或否定句借助動詞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)主觀義務主要用于肯定句和疑問句。由must引導疑問句，肯定回答用must，否定回答用neednt。Eg:Mus

5、t I finish my homework before six oclock?-Yes,you must./No,you neednt/No,you dont have to.(2)表示肯定的猜測，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 accordin

6、g 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 not come out to play because he_ help his dad in the garden. A can B can