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nominal clause (whether / if (The question is whether it's worth…
nominal clause
whether / if
The question is whether it's worth trying.
有is 表语从句
Whether she comes or not, makes no difference.
主语从句
He must answer the question on whether he agrees to it or not.
同位语从句
who, whom, whose, what, which
既起连接作用，又担成分
We're worrying about what we should do next.
No one knows who he was waiting for.
what
已知: what the teacher is saying...
已知：what is written in the law...
关系词：...what side effects the drug remains
that
不作句子成分，没有意义
where, when, how, why
既是连接词，又作状语
What I am anxious to know is when we can visit the museum.
I don't know where we're going to the meeting.