注意要点:1. 一下情况不能用关系代词 which (who),只能用关系代词 that。 1) 当先行词被最高级或序数词修饰时。 This is the best book that I've ever read。 This is the first thing that I want to do。 2) 当先行词是 anything, everything, nothing 时。(something用 which, that都可以。) He will do everything that he can to help that fatherless child。 3) 当先行词被 all, only, very, any, just, no, much等词修饰时。 I'm not interested in all that he told me。 This is the very book that I've been looking for。4) 当先行词既指人又指物时。 We talked about the things and persons that we remembered。 5) 当句子中已有 who指人时,关系代词用 that。 Who that has common sense will do such a thing?6)