1、名词性从句
（1）What he wants to tell us is not clear.
他要跟我们说什么，还不清楚。
（2）Its splendid that you passed your exam.
你通过考试了，真棒。
2、形容词性从句(定语从句)
（1）这是他们曾经住过的地址。
It is the place where he once lived.
（2）The one who cleans the blackboard should be praised.
擦黑板的那一位应该受到表扬。
3、副词性从句
（1）I didn’t realize how great my mother was until I became a mother.
直到我成为了一个成年人我才意识到我的母亲是多么的特殊。
（2）While John was watching TV, his wife was cooking.
当约翰在看电视时，他的妻子正在做饭。