(1)先行词被①形容词最高级 ②序数词 ③数词几种词修饰或被 ④only、any、few、little、 no、all、one of等修饰时.
(2)先行词为all、much、little、none、few、one、something、anything等不定代词时.
(3)先行词中既有人又有物时.
He was looking pleasantly at te children and parcels that filled his bus.
(4)先行词在主句中作表语关系词在从句中作表语时.
The village is no longer the one that was 5 years ago.
(5)当主句中含有疑问词which时.
Which are the books that you bought for me
宜用which而不用that的情况
(1)在非限制性定语从句中
(2)在关系词前有介词时
(3)当先行词本身是that时
(4)当关系词离先行词较远时
关系词who与that指人时,也有不同情况分别用不同的关系词
(1)当主句是there be句型时,关系词用who.
(2)先行词是为anyone、those、someone、everyone、one等词时,关系词用who.
(3)当主句是who作疑问词时,关系词用that.
Who is that girl that is standing by the window?
(4)whom在从句中只作宾语,可被who取代.
