[00:23.60]The girl that cameto see me is myfriend.(主语)that=the girl

[00:55.36]which指物，在定语句中作主语或宾语

[01:16.94]A plane is a machinewhich can fly.(主语)which=a machine

[01:41.72]The book(which)Iread yesterday wasvery interesting.which=the book

[02:10.28]who,whom,whose指人，在定语从句中分别作主语，宾语和定语

[02:41.09]The woman who sellsvegetables is myneighbor.who=the woman

[03:13.00]Who's the man(who/whom)you just talkedto?who/whom=the man

[04:19.60]Do you know the girlwhose mother is anEnglish teacher?whose=the girl's

[05:11.80]when指时间，在定语从句中作时间关语

[05:23.69]I'll never forgetthe day when we meteach other.when=on that day

[06:01.62]Summer is the seasonwhen many peoplelike swimming.when=in the season

[06:48.98]where指地点，在定语从句中作地点状语

[06:56.27]This is the housewhere she used tolive.where=in that house

[07:35.86]This is the housethat/which she likesto visit.that/which=the house

[08:39.98]why指原因，在定语从句中作原因状语

[08:49.01]I don't know thereason why he'soften late.why=for that reason