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where which that引导的定语从句有何区别?

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where which that引导的定语从句有何区别?
怎样判断一个从句由哪个词引导?
例 This is the office ( )he worked
This is the office ( )he worked in
This is the office (where) he worked.(he worked结构完整,不用加宾语)
This is the office (which) he worked in.(he worked in少了个宾语,所以用which或者that都可以)
where引导的定语从句结构完整,不缺主语或宾语;
而which或that引导的定语从句结构不完整,缺主语或宾语.
如:
This is the place that/which we lived in last summer.
That is the school that/which we visited in 2005.
再问: 那if引导的从句呢? 例 I don't know if he__(come) if he __(come) I'll tell you 麻烦详细一点 O(∩_∩)O谢谢
再答: I don't know if he will come. (come) 这个if是是否的意思,引导宾语从句,从句的结构完整,但意思上应该是“他是否会来”,这if是个连词,也可以换成whether if he _comes_(come) I'll tell you. 这个if是如果的意思,引导的是条件状语从句。条件、时间状语从句中的时态比较特别,用一般现在时表示将来,所以用comes.