英语三大从句为(1)名词性从句，(2)定语从句，(3)状语从句。
其中名词性从句又有：主语从句，宾语从句，表语从句和同位语从句。
状语从句又分时间，条件，让步，目的，地点，结果，比较，方式，原因等九大状语从句。(因状从太多，后只择一举例)
1,主语从句: What he said is funny.
2,宾语从句：I think you are right.
3, 表语从句：The problem is how we can get there.
4, 同位语从句：I have a question where your father works.
5, 定语从句：Do you know the man who is under the tree over there.
6, 状语从句：While I was watching TV, my sister was doing her homework.
主语从句，that China has the word 's largest population is a well－know fact 。中国人口占世界第一是众所周知的实事.It is strange that she did not come yesterday。
定语从句，the girl who play the piano very well is his friend那位钢琴弹的很好小姑娘是他的朋友。
状语从句，we were abaut to start when it began to rain。我们正要动身，突然天下起雨来。
