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《Grammar》公开课PPT课件优质课下载
Must表示主观上的“必须,应该”,其否定形式mustn’t表示禁止。对比:have to表示客观上的“不得不”,可用于各种时态。
以must开头的问句,其否定回答用needn’t或don’t have to。
—Must I clean the dining room at once?
—No , you needn’t/No , you don’t have to.
—我必须立刻清扫餐厅吗?
—不,你不必。
You mustn't leave the gate open.
你不要让大门敞开着。
You don't have to start so early, for there is no bus at such hour.
你不必那么早就出发，因为这个时间没有公交车。
complete these school rules with must,mustn't or don't have to
1.You _______ be on time for class.
2.You _______ run in the school corridors.
3.You _______ give your homework to the teacher on time.
4.You _______ be rude to teachers.
5.You _______ bring food or drink into the classroom.
6.You _____________________________ write on your school textbooks.
7.You ______________ go into the playground during the break.
must / mustn't / don't have to
don't have to
Modal Verb may and might
1.表示请求、允许、许可,might比may语气委婉。
You may use my bike.你可以用我的自行车。
2.表示推测,常用于陈述句中,语气比较弱,把握性不大。might语气比may还要弱。
Life is unpredictable ; even the poorest might/may become the richest.