248、that， which
that 和which 两个词都可以作关系代词，引导从句，在定语从句中作主语或宾语。但两词在用法上存在着差异。
一、that多指物，有时也指人，而which只能指物，两词指物时在用法上大致相同。例如：
This is the irrigation system that (which) the peasants built last year. 这就是农民去年修的灌溉网。
I've read the newspaper that (which) carries the important editorial. 我已经看过登载那篇重要社论的报纸。
二、指物时，引导限定性定语从句用that或which，引导非限定性定语从句只能用which。例如：
Here is the book that (which) I told you about.这是我告诉过你的那本书。
Here is your book, which I have enjoyed very much.这是你的书，我很欣赏。
三、that作介词宾语时，介词不放在that之前，只能放在从句中原来的位置上，但which可以作介词的宾语。例如：
Can you lend me the book that you were talking about the other day ? 你可以把你那天谈的那本书借给我吗？
Can you lend me the book about which you were talking the other day ? 你可以把你那天谈的那本书借给我吗？
四、先行词被序数词、形容词最高级所修饰时，或者先行词为all、everything、nothing、something、anything、little时，必须用that，不能用which。例如：
That's all (that) I know.我知道的就是这些。（that在这种句子中常省略掉）
Is there anything (that) I can do for you in town?有什么事我可以在城里帮你办吗？
The first thing (that) we should do is to work out a plan. 我们应该做的第一件事是制定出一个计划。
That is the best film that I have ever seen.那是我所看过的电影中最好的一部。
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