请写出must的否定形式和need的否定形式谢谢!

请写出must的否定形式和need的否定形式谢谢!
请写出must的否定形式和need的否定形式
谢谢!

请写出must的否定形式和need的否定形式谢谢!
v.aux.
[无时态和人称变化,后面接不带 to 的动词不定式]
[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.
We must keep our word.
我们必须遵守诺言.
You must not do it.
你不可以做那件事.
We must tell him.
我们必须告诉他.
【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.
I had to do it yesterday.我本该昨天做.
I shall have to go there some day.总有一天我会去那儿的.
[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.
现代英汉词典must
v.
必须；应当
We must obey orders.
我们必须服从命令.
I must shut the door,or the rain will come in.
我必须把门关上,不然雨就进来了.
必定；非常可能
You must be tired after your long journey.
你走了这么远的路,一定很累.
词性变化
n.
必需的东西； 必须做的事
Warm clothes are a must in the mountains.
住山里必须备有厚衣服.
简明英汉词典must
aux.
必须,应当,很可能,一定,必须,肯定,可以

mustn't
needn't

两种情况:
do not have to和do not need to一组
mustn't 和needn't 一组

mustn't 和needn't
肯定了。

need——needn't：don't have to must——needn't can——can't may——mustn't