Can't 、mustn't 、shouldn't 的区别?（急）比如一句句子：He ______ be in the room,I didn't see him.莪知道要用can't,但是为什么呢?为什么不用mustn't 、shouldn't

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Can't 、mustn't 、shouldn't 的区别?（急）比如一句句子：He ______ be in the room,I didn't see him.莪知道要用can't,但是为什么呢?为什么不用mustn't 、shouldn't
Can't 、mustn't 、shouldn't 的区别?（急）
比如一句句子：
He ______ be in the room,I didn't see him.
莪知道要用can't,但是为什么呢?为什么不用mustn't 、shouldn't

Can't 、mustn't 、shouldn't 的区别?（急）比如一句句子：He ______ be in the room,I didn't see him.莪知道要用can't,但是为什么呢?为什么不用mustn't 、shouldn't
can't 不可能,不太可能（表示推测某事发生的可能性非常低）
mustn't是指不准,不许
例句：you mustn't tell Jerry what I have bought不准你告诉杰瑞我买了什么,不能用于推测
shoudn't是指不该,不应该..（认为做某事不对）
you shoudn't come here
你不应该来这
He can't be here,I didn't see him
表示推测他在这的可能性还小,所以用can't

Can't 不可能
mustn't 不必
shouldn't 不应该
He can't be in the room, I didn't see him.
他不可能在屋子里，我（刚才）没有看见他。
从意思上看就知道用can't 是正确的。

can't表否定推测
肯定推测用must
不确定推测用may或might
shouldn't不应该,mustn't千万不能

can't 表示一种推测的语气,含有说话人不确定的想法,意思是"他不可能在房间里"
mustn't 表示禁止,语气很强烈
shouldn't 更多用于虚拟语气句等中,也是will的否定,意思为不应该
句子意思是,他不可能在房间里，我刚没看见他(didn"t过去式有了刚刚的意思),里面表示的是说话人推测的语气,所以用can't...

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表示禁止的时候:mustn't （强硬些）对推测的否定时：Can't 表示不应该做：shouldn't

mustn't表示一定不能，侧重于主观上不允许
shouldn't表示不应当
can't表示不会，不可能，侧重于推测

oughtn't, mustn't, can't区别 mustn't neendn't can't 的用法 mustn't needn't can't和mustn't有什么区别请详解 can`t与mustn`t意义和用法的区别看一下这道题:mustn't和can't的区别? can't和mustn't有什么区别? 情态动词mustn't和can't有什么区别? can‘t be 和mustn’t be的用法情态动词的can't和mustn't的区别 may not/can't/couldn't/needn't/mustn't举例区别意思和用法 can’t mustn’t shouldn’t needn’t 在用法上怎么区别? A computer____think for itself .A.mustn't B.needn't C.can't D.isn't 在句子中如何使用couldn't,mustn't,can't,needn't? mustn't/can't/won't/shan't的用法和区别,请详细一点. can’t mustn’t shouldn’t needn’t 在用法上怎么区别? mayn't be ,can't be,mustn't be,shouldn't be的区别用could,can,can't,must,mustn't need't may填空