定语从句例句20个：
1、This is the topic/theme that I'm tired of.
2、He is the teacher who helped me.
3、We all like that speaker who is very humourous.
4、The meeting that you have missed yesterday was very important.
5、The vase that I broke yesterday was very expensive.
6、That's just the topic that I'm very interested in.
7、The boys who are playing football are from Class One.
8、 Yesterday I helped an old man who lost his way.
9、Mr. Ling is just the boy whom I want to see.
10、The man who/whom you met just now is my friend.
11、They rushed over to help the man whose car had broken down.
12、Ocean currents affect the climates of the lands near which they flow.
13、They explained the reason to us why they had hated us before.
14、His father died the year (that/when/in which)he was born.等等。