1.
先行词为来those, one .he,that 时
:Those who respect others are usually respected by others。
2.在
非限定性定语从句中,只能用who/which指人,
He has a sdaughter,who has gone abroad for further study.
3.由“介词+
关系代词”引导的定语从句中,只能用whom指人。
he has a close friend, from whom he gets much help.