从句一般都有引导词,如 what,which,who,when,that,when,because等.两个简单句可以用这些词连成一个复杂句.如,
I am here.He is there.
I am here when he is there.
He is home.He is sick.
He is home because he is sick.
He is home when he is sick.
找从句,先看引导词.引导词后应当是完整句子,要有主谓（宾）.从句还可以根据在句子里的作用分主语从句,宾语从句等.见下：
1.主语从句
例句：What he said is not correct.他所说的不对.
2.宾语从句
例句：He loves what she buys.他喜欢她买的东西.
3.表语从句
例句：It seems that they will not come.好像他们不来了.
That is where he was born.那就是他的出生地.
4.同位语从句
例句：The guy,who sold his BMW,is crazy.那个卖了宝马的
人有点不正常.
(同位语从句要用逗号分开.）
5.定语从句
例句：The lady who is dressed in red has become a movie star.那位穿红衣服的夫人已经成了电影明星.
6.状语从句
例句：No matter how hard you are trying,you will never jump that high.不管你怎么用劲,你永远跳不到那么高.
Whoever you pick,you cannot choose her.你选谁都行,但不可以选她.
Wherever he went,he could not go to that place.他哪里都去,就是无法去那个地方.