need，must 和 have to 的区别

need，must 和 have to 的区别

need:需要；必要；需求；有———必要；贫穷；危急
She feels the need of companionship.
她感到需要友谊。

must:[表示义务、命令或必要]必须, 应当
Soldiers must obey orders.
军人必须服从命令。
【说明】过去、未来、完成等式可用 have to 的相应形式来代替, 例如: I must [have to] do it today. 我必须今天做。
[表示推断或指具有较大的可能性]很可能; 谅必[否定用cannot be, could not have +p.p]

You must be very tired.
你一定很累了。
He must have earned a large sum of money.
他一定是挣了一笔巨款。
[表示主张]一定要, 务必

If it is really lost, it must be found.
如果真丢了, 一定要找回来。
[表示不可避免性或肯定性]必然要, 必定会

Man must die.
人必有一死。
[表示与说话人愿望相反及不耐烦]偏要

Why must it rain on Sunday?
偏要在星期天下雨, 讨厌!
Just as I was sitting down to supper, the telephone mustring.
正当我坐下来用晚餐时, 偏偏电话铃响了。
[方][表示请求]

Must I go now?
我现在可以走了吗?
n.
[口]必须做的事, 必需的东西

The new film is an absolute must.
这部新片不可不看。
adj.
[口]绝对需要的, 不可缺的

must legislation
不可缺少的立法
This is a must book for your reading.
这是一本你必须要读的书。
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have to
[have got to] 不得不, 只好
I have to go.
我必须离开。

need 需要
must 必须
have to 不得不
must 语气更强烈

首先每个词的意思必须弄懂，must 意为“必须”have to意为“不得不”need意为“需要”，must和have to 的区别是，must是主观上必须，如we must study hard for our country. have to 是客观上的，因为某事而不得不怎么样，如，it is raining hard,we have to stay at home.而need的否定形式needn't和dones't have to 相等，都意为不必，must引导的疑问句由needn't 回答，肯定回答还用must,而need 引导的疑问句，肯定回答用must,否定回答用needn't,这几个词的用法就这么多