a. 先行词被序数词或形容词最高级所修饰,或本身是序数词、基数词、形容词最高级时,只能用that,而不用which.例如:
He was the first person that passed the exam. 他是第一个通过考试的人。
b.被修饰的先行词为all, any, much, many, everything, anything, none, the one等不定代词时,只能用that,而不用which.例如:
Is there anything that you want to buy in the shop? 你在商店里有什么东西要买吗?
c.先行词被the only, the very, the same, the last, little, few 等词修饰时,只能用that,而不用which.例如:
This is the same bike that I lost.这就是我丢的那辆自行车。
d. 先行词里同时含有人或物时,只能用that, 而不用which.例如:
I can remember well the persons and some pictures that I saw in the room.我能清楚记得我在那个房间所见到的人和一些照片。
e.以who或which引导的特殊疑问句,为避免重复,只能用that.例如:
Who is the girl that is crying? 正在哭泣的那个女孩是谁?
f.主句是there be 结构,修饰主语的定语从句用that,而不用which.例如:
There is a book on the desk that belongs to Tom. 桌子上那本书是汤姆的。