*It is a fact\a pity\a question\good news that...
*It seems\appears\happened\has turned out that...
*It is clear\important\likely\possible that...
*It is said\reported\estimated\has been proved that...
It is said that comic books create a connection between people of the same generation.
It seems that the performance is very useful.
What we lack is experience.
How the plan is to be carried out should be discussed again.
I did know why I felt like crying.
1）宾语从句可位于及物动词、介词和某些形容词后。连词that常可省略。介词后一般接疑问词引导的宾语从句。in that(因为),except that(除了),but that(只是）已构成固定搭配，其他介词后一般不接that引导的宾语从句。如：
I promised that I would change the situation.
All this is different from what American young people would say about friendship.
He is certain that watching so much television is not good for children.
This article is well-written except that it is a bit too long.
He has made it clear that he would not change his mind.
He didn't think that the money was well spent.
Perhaps the most important thing to remember is that there is no one common type of life in America.
The reason why so many people died there is that there were not enough food supplies.
It looks as if successful international cultural communication will make the world smaller.