we must listen to the teacher carefully.we mustn't talk with each other at class.
You mustn't play football in the street.You mustn't tell a lie to parents.You mustn't point at others with chopsticks.
1,must You must get up early tomorrow or you will be late.你明天必须早起不然会迟到.2,mustn't You mustn't watch TV without permission.没有经过允许不可以看电视.
15、Youarevaluabletotheorganization,youmustn'ttakechances.组织上对你很器重,你不得掉以轻心。
must的否定式mustnot/mustn’t,意思是“不应该、禁止”,语气较强烈。must的基本意思是“必须;应该;必定;必然要”,通常会作为情态动词使用。