找出下列句子中的主语从句及其引导词,并且指出引导词是否充当成分,充当什么成分.1.That we shall be late is certain.

找出下列句子中的主语从句及其引导词,并且指出引导词是否充当成分,充当什么成分.1.That we shall be late is certain.
2.That the driver could not control his car was obvious
3.It is certain that we shall be late.
4.It was obvious that the driver could not control his car.
5.Is it possible that they will come tomorrow?
6.It is clear that he was telling the truth.
7.It’s probable that we’ll be a little late.
8.What caused the accident is a complete mystery.
9.It worried her a bit that her hair was turning grey.
10.It shocked me that Peter didn’t tell anybody where he was.
11.Who was responsible for the accident is not yet clear.
12.It’s a pity that you can’t go with us.
13.What he did is not yet known.
14.It is said that he has been there many times.
15.It is not yet clear who was responsible for the accident.
16.When they will have the sports meet is still a question.
17.It seems that he has lost something.
18.What he said at the meeting encouraged everyone.
19.What caused the accident was a broken bottle.20.It remains a problem whether it is true.
21.Whoever breaks the law is sure to be punished.
22.What she looks like doesn’t matter.
23.How this happened is not clear to anyone
24.Whoever comes is welcome.
25.Whether he’ll come here isn’t clear.