needs的用法
needs为副词，相当于necessarily, of necessity.must needs和needs must均可表示“必须，必定，不得不”，这层意义上可以通用;但must needs还可表示“偏偏，偏要”，含有讥讽、不满的意思，而needs must则一般无这层意思。例如：
I must needs go there now.
我现在非到那里去不可。(可用needs must)
Needs must when the devil drives.
情势所迫不得不那样。
She must needs go away when I want her.
我正需要她时，她偏偏离开了。(不可用needs must)
The telephone must needs ring when I went to bed.
我上床睡觉时偏偏有人来电话。(不可用needs must)
need指主语的主观特需情况而使之必要。need既可以作助动词，又可以作行为动词。作助动词时，need没有人称和数的变化，后接不带to的不定式(动词原形)，否定式为needn't.作行动动词时，need同别的行为动词一样，有人称和数的变化，后接带to的不定式，否定式要在前面加don't(doesn't, didn't)，疑问句用do (does, did) 提问。例如：
There need be no hurry, need there?
He need never know.(=He never needs to know.)
I need only add a few words.(= I only need to add a few words.)
比较：
Father sent me the book, so I didn't need to write to him for it.
父亲把那本书寄来了，所以我不必为此给他写信了。(信没写)
Father sent me the book, so I needn't have written to him for it.
父亲把那本书寄来了，所以我本不该为此再写信给他的。(信已写)
She didn't need to come.她不必来的。(实际也没来)
She needn't have come.她本来不必来的。(但却来了)
Note:
作助动词用时，need只用于疑问句中和否定句中，在肯定句中常用must, have to, should, ought to等。例如：
Need you do it right now? I needn't, but he must.
She doesn't need to be told.She has already known it.
(客观情况使得告诉她没有必要：她已经知道)
She needn't be told.We should keep it secret from her.
(主观上不愿告诉)
must not表示禁止，是说话人强有力的劝告或命令，意为“一定要，不准”。因此，在回答由must引导的问题时，如果是否定的回答，表示“不必，没有必要”，不能用mustn't，而要用needn't或don't have to.试比较：
You must not drive fast.你不能开快车。(路险或有速度限制)
You needn't drive fast.(时间充裕)
You must not tell others.(警告)
You needn't tell others.(没有必要)
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