(what) you really need is a good meal and a good rest.为什么用what ,不用that?

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(what) you really need is a good meal and a good rest.为什么用what ,不用that?
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(what) you really need is a good meal and a good rest.为什么用what ,不用that?
(what) you really need is a good meal and a good rest.为什么用what ,不用that?

(what) you really need is a good meal and a good rest.为什么用what ,不用that?
that引导句子的特点是:它只负责引导句子,不做任何成分.
what 引导句子,要在句子中作主语或宾语或表语的.例如:
what you said is wrong.(在 what you said中,what 做的是said 的宾语)
在你的这句话中, 在what引导的句子中:what you really need ,what 做的是need的宾语.所以不能用that.

what在这里起了主语的作用.你所需要的什么东西那应该是好吃好睡.