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CAn t mustn t

1.mustn't 在英语中不能用于表示推测,但是可以表示“禁止/不允许”之意。 如:You mustn't smoke here. 在这里你不许抽烟。 2.can't/couldn't 表示推测时,意思是“不可能...”,语气非常坚决的否定推测。 根据动作发生的时间,一般分为以下三种情...

can't表示不能,不可能.是推测的意思. musn't表示禁止.是命令的意思. 比如: You can't be Tom. He is much taller. 你不可能是汤姆,他高多了.(推测) You musn't smoke here. 你禁止在这里吸烟.(命令)

can't表示不能,不可能.是推测的意思. musn't表示禁止.是命令的意思. 比如: You can't be Tom. He is much taller. 你不可能是汤姆,他高多了.(推测) You musn't smoke here. 你禁止在这里吸烟.(命令)

首先都是情态动词,所以后面都跟动词原形。 意思不一样。 不应该/ 不能(一定不)/ 不必, 例如: You mustn't blame her so hard this time. He can't be my father because he has gone to America. I needn't tell you the obvious truth, yo...

mustn't 语气强,”禁止”;千万不要的意思 例如:You mustn't step on the grass. needn't 表示不必这么做:常做must问句的回答:Must I finish my homework today? No, you needn't. can't ”不能”; You can't be too serious;问句回答时:Can I go...

You must say happy spring festival to your grand parents and relatives. You must watch the TV program at spring festival eve with your parents. You mustn't play fireworks too much. You must eat dumplings with relatives. You can...

①表示“必需”“一定”“必要性” 1.must表主观上的必需,而have to表职责或义务,强调客观. 2.need作为情态动词用于疑问句或否定句.Need you……?的答句是Yes,I must.或No,I needn't(don't have to)对问句表示有必要做某事的肯定答语是Yes,you must/have ...

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...

“can't+have+done”表示对过去事情的否定推测,译成“不可能做过某事”。 Mr. Smith can't have gone to Beijing, for I saw him in the library justnow. 史密斯先生不可能去北京了,我刚才还在图书馆见过他。 Mary can't have stolen your money....

needn't 不需要;不必;强调客观条件 .常做must问句的回答:Must I finish my homework today? No, you needn't. mustn't不许,不准,不允许 ;命令的口气,语气最强烈。”禁止”You mustn't step on the grass. 甲:Must I finish my homework? 乙:...

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