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含must的否定句

must 有非推测性用法和推测性用法两种情态意义,变否定句的方法不同.▲非推测性用法的must表示义务,情态意义为“必须”.he must finish his homework before bedtime. 他必须在上床前写完作业.此用法的must两种否定形式:1. 结构上否

Must变为否定句,通常变为don't/doesn't have to 或者don't/doesn't need to或needn't do或can't.因为must的否定形式mustn't意思已经变为'千万别',不再表示不必须的意思了请采纳,谢谢~

must的否定形式就是needn`t.needn`t是不必 mustn't是禁止,不允许 举例子:Must I go now?(我现在一定要走吗?) Yes, you must.(是的,你一定要走) No, you needn't.(不,你不需要走.意思是你可以不走) No, you mustn't.(不,你不许走.意思是你一定要留下)

must wear must提前,后跟动词原形 回答,yes, I must. no, i needn't

不行,must 后边如果加not的话,就变成语气非常强烈的“禁止”的意思.一般来讲,must的否定形式是:should not

must 的否定句可用 needn't,也可以用mustn't1)mustn't 语气强硬点,带有禁止的意思:You mustn't fire without my signal.没我的信号不许开枪.You mustn't do that. It's wrong.你不能这么做.这是不对的.2)needn't语气较为温柔,意思是不需要:You needn't talk to anyone if you don'twant to.不想说话的时候,你可以不说.Well, you needn't tell me anything if you don't want to.好吧,如果你不想告诉我,可以什么也不说.

economic efficiency and benefit

1. You must phone your father, needn't you? (must表示“必须”) 2. You mustn't smoke in the office, must you? (mustn't表“禁止”) 3. You must be thirsty, aren't you? (must表示推测“一定”) 4. You must have known it, haven't you? (must表示推测“一定”) 5. You must have seen the movie last night, didn't you? (must表示推测“一定”)

mustn't 是禁止的意思,就是:必须不的意思.needn't是不需要的意思,也就是说:不是必须的意思.两个都是must的否定,看你语境需要哪个意思了.我估计如果是考试出题的话,指的是第二个.

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