1. 先行词是one, ones, anyone时,宜用who。
Anyone who breaks the law should be punished.
Those who want to see the film sign up here.
The boy that you met at school gate yesterday morning is our monitor who studies very hard.
4. 在以there be 开头的句子中。
There are many young men who are against the plan.
Women _______ drink more than two cups of coffee a day have a greater chance of having heart disease than those ________ don’t.
A. who; 不填 B. 不填; who C. who; who D. 不填; 不填
（一）as, which 引导的非限制性定语从句的区别
As is known to all, Edison invented the telephone.
= Edison invented the telephone, as is known to all.
He turned out to be very successful, which was more than we could expect.
① ________ has been announced, we shall have our final exams next month.
A. That B. As C. It D. What
② Li Yu chun was titled as the top thin beauty in Asia, ____ caused a lot of disagreements in the field of entertainment.
A. that B. which C. as D. it
（二）who, which, that 作定语从句的主语时，其谓语取决于先行词。
Those who want to go should put up your hands.
He is one of the students who have passed the exam.
He is the only /very one of the students who has passed the exam.
① He was the very one of the students who praised at the class meeting.
A. was B. were C. is D. are
② I, ____ your good friend, will try my best to help you out.
A. who is B. who am C. that is D. what is
The girl for whom he had fought all his life no longer seemed important to him.
He is the man about whom we were talking just now.
The speed at which wild animals are being destroyed has increased.
This is the hero of whom we are proud .
1）关系代词在定语从句中作介词宾语时，关系代词只能用which 或 whom; 不可用that 或who 代替。
2）该介词通常可以放在关系代词之前，也可放在从句之尾。但有些固定的动介词组不可分割，介词不能提前. 例如：look after, look at, look for, take care of …
I want to find the pen with which I wrote the letter.
Here are the picture-books （which） the children are looking for.
Here are the picture-books for which the children are looking.