不需要用英语怎么说？

needn't.
不需要。
need

v.需要；必需
n.需要；必要；缺乏
aux.需要，必须（无时态、人称变化，后与不带 to 的动词不定式连用，多用于疑问句和否定句）
用作动词 (v.)
例句
You look tired. You need a good rest.
你看来累了。你需要好好休息一下。
If I need you to come and help, I'll call you.
如果我需要你来帮忙,我会打电话的。
If the ground is too dry, then you need to water it.
如果地面太干燥,那么你就需要给它浇浇水。
You need some warm clothes for the winter.
冬天来了,你必需准备一些保暖衣物。
I need to spend more time studying.
我必需花更多时间来学习。
用作名词 (n.)
The doctor told me I was in need of a good rest.
医生对我说，我需要好好休息。
I feel a need to talk to you about it.
我觉得有必要跟你谈谈那件事。
There isn't much need for further research.
没有多大必要进行进一步研究。
We are collecting money for children in need.
我们在为贫困儿童募捐。
My neighbors helped me a lot in my time of need.
我的邻居在我缺衣少食的日子里帮了我很多忙。

Don't need
need not=needn‘t
不需要

希望可以帮到你

我不需要 I don't need

需要
[xūyào]
demand
need
needs
require
want
汉英词典
需要
[xū
yào]
(应该有或必须有)
need；want；require；demand；do
with
我们需要一个和平的国际环境。
we
want
[need]
a
peaceful
international
environment.
(对事物的欲望或要求)
needs
经济上的需要
economic
needs;
满足市场需要
meet
the
needs
of
the
market

NO需要