定语从句中which的成分

　　Which 和that同为关系代词，都可指物，并且有时会觉得用that 也可以，用which 也没错。但在哪些情况下是只能用which的呢？

　　1.在非限定性定语从句中，无论如何也不能用that

　　A.This brunch of carnation, which is wound by silk ribbon ,is the first gift to my mom.这束康乃馨是送给妈妈的第一份礼物，它被丝带所缠绕。

　　B.These books,which you can get at any corner of the town will give you all the information.这本书你可以在镇里的各个角落获取得到，它会给你所有的信息。

　　2.关系代词前面出现介词时

　　A.Those days in which you could travel without a passport has gone.那些你不用带护照可以旅行的.日子一去不复返了。

　　B.That`s the motel at which we stayed several years ago.那是我们许多年以前停留的汽车旅馆。（此处which不可替换为that）

　　3.当先行词本身为that（指代）时

　　A.what about that which had appeared in recent activities.那个怎么样，在最近的活动中出现过. (结合具体语境看that所指代的是什么)

　　B.The knowledge are from various fields and that which display the waves of human being.知识来自不同领域并且它也彰显这人类的智慧。（从句中that指前面的知识，只能用which作关系词）

　　4当先行词是baby, child等词时

　　A.Have you notice that child which has lost his way to home in the supermarket ?在超市，你注意到那个找不到回家路的孩子了吗？

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