这分别是什么名词性从句?为什么?

1.The question is whether the film is worth seeing.
the question--主语 is-系 whether--引导的是表语从句.全句是主系表结构
2.Do you doubt thatI believe you?
这是个疑问句,你先还原成陈述句,即:
You doubt that i believe you.
you--主语 doubt--谓语 that i believe you宾语从句,它做doubt的宾语成分
3.We were all very worried over the fact that you were ill.
we--主 were--系 very worried over the fact--表语
that you were ill---同位语从句,that引导的部分,是解释fact的,不是定语从句,因为从句的引导
词that不在句中做成分.
4.It looks as if it's going to rain.
it--主,looks--系动词 as if it is going to rain--表语
(look 这种用法是当系动词,例如 it looks pretty.it looks nice.it looks very good.后面接的都是adj.)
5.This museum is not what it was ten years ago.
还是表语从句,原因我前面已经分析过了,这个留给你自己分析理解了.