must的否定句怎么写？
must 有三个意思，这三个意思分别对应着不一样的否定形式。第一个意思是“必须”，其含义相对应的否定含义为“不必”：
We must be hurry. 我们必须快一点。
I must leave now. 我必须马上走。
Must he get up so early? 他必须起那么早吗？
此时must一般的否定含义为：不必，可以用：don’t have to; needn’t; don’t need to
如：Do we have to finish this today?’ ‘Yes, you must.’
“我们今天一定得完成这工作吗？”“对，必须完成。”
No, you needn't. 不，不必完成。
No, you need not. 不，不必完成。
No, you don't have to.不，不必完成。
No, you don't need to. 不，不必完成。
---Must you hand in your report today? 你的报告今天就必须交上吗？
---Yes, I must. 是的，必须交上。
---No, I needn't. =No, I need not. = No, I don't have to. = No, I don't need to.不，不必要。
注意这里不能用 mustn't，因为 mustn't 意思是“禁止，不准，或一定不是”。
第二个意思作为“必须”时，其含义相对应的否定含义是“禁止，不许可，不允许,不准”，所以此时must的否定形式是 mustn't，或may not意为“禁止、不准”，比如：You mustn't take the book out of the reading room.
You may not take the book out of the reading room.
你不准把书带出阅览室。
Everyone mustn't make a noise here.
Everyone may not make a noise here.
大家不准出声。（禁止出声）
第三个意思是“肯定、一定，准时，一准”，用来表示肯定的推测，这个时候往往是 must be（do） 结构：That boy must be Paul. 那个男孩肯定是保罗。
It must be June 5th today. 今天肯定是6月5号。
He must be mad. 他一准是疯了。
His absence must have been noticed.他的缺席一定被人注意到了。
He must have known what she wanted.他一定早已知道她想要什么了。
You must know him ─ he's an institution around here!你一定认识他——他是这一带的知名人士！
那么，表示否定的推测时，其否定形式是大多人用 can't，请看：That boy can't be Paul. 那个男孩不可能是保罗。
It can't be June 5th today. 今天不可能是6月5号。
He can't be mad. 他不可能疯了。
His absence can’t have been noticed.
His absence mustn’t have been noticed.他的缺席一定没被人注意到了。
He can't have known what she wanted.他一定不知道她想要什么了。
He mustn't have known what she wanted.他一定不知道她想要什么了。
You can’t know him ─ he's not an institution around here!你一定不认识他——他不是这一带的知名人士！
You mustn’t know him ─ he's not an institution around here!你一定不认识他——他不是这一带的知名人士！
注意：在英语里，表示否定的推测时，用must not(mustn’t),已经被越多的人。
---Must he be in the library? 他一定在图书馆吗？
---Yes, he must. 是的，一定。
---No, he can't. 不，不可能。
所以，在遇到 must 有关的句子时，首先要确定它在句中的词义，看看是“必须”，而且是哪一种“必须”；再看看是不是表示推测的“一定，一准”，再根据其具体含义确定它的否定形式。
must 的否定句可用 needn't，也可以用mustn't
1）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。
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