1.what we need is time 2.what we need are good doctors 这两句话为什么用what,what做什么成分为什么不用that.

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1.what we need is time 2.what we need are good doctors 这两句话为什么用what,what做什么成分为什么不用that.

1.what we need is time 2.what we need are good doctors 这两句话为什么用what,what做什么成分为什么不用that.
1.what we need is time 2.what we need are good doctors 这两句话为什么用what,what做什么成分
为什么不用that.

1.what we need is time 2.what we need are good doctors 这两句话为什么用what,what做什么成分为什么不用that.
在你的句子裏面,what是time和doctors的表语.
1.what we need is time
== Time is what we need.
what == something
2 what we need are good doctors .
Good doctors are what we need.
what== people whom / the people that
3 用what,不用that是因为表语部分没有名词可以指代.

首先两个句子中what 引导的都是主语从句,做need 的宾语。
而that 没有这种用法。