that, which 和who在定语从句中做关系代词,指代人或物。
1)that和which主要在定语从句中做主语或宾语,指代物;
比如:This is the place which/that I visited last year
2)who在定语从句中做主语,指代人;
比如:The girl who is standing under the tree is my younger sister.
3) 有几种情况只能选择that:
1.当先行词是或被序数词,最高级,不定代词修饰时,关系词用that不用which。
2.当先行词既有人又有物时,用that。
3.当先行词带有the only,the very,the same,the last,the one等词时,用that不用which。
4.当主句中有who或which时,为避免重复用that
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