11、关系副词when与where、why、that
　　when 指时间 = in / at / on / during which
　　where指地点 = in / at / from / which
　　why指原因 = for which

　　当先行词为way、day、reason、time时，可用that作关系副词。（非正式场合）
　　I don’t like the way that / in which / he talks.
　　当time作先行词时，关系词可以省掉。
　　This is the first time I have given you a lesson in French.

　　12、必须注意的问题
　　（1）关系词作主语时，从句中谓语的数。
　　（2）注意区别定语从句与强调句。

　　①定语从句中关系词作从句成分，复合句。
　　②强调it无意义，that / who不是引导词。
　　③强调it is / was和that / who后如果句子意思讲得通则是强调句，讲不通则不是。

　　It is the museum that / which we visited last year.(定语从句)
　　It was in the hotel that we stayed last night.（强调句）

　　（3）定语从句与同位语从句的区别。
　　①定语从句引导词被称为关系词，that充当主语、宾语、表语。有时可省略。
　　②同位语从句引导词被叫做连词，that不能充当任何成分，不可省。
　　Word came that their army was defeated.(同位语)
　　We expressed to them our wish that was the same as their.(定语)

　　（4）关系词在从句中省略的情况。
　　①关系词作宾语，前无介词时。
　　②关系词作表语。

　　（5）限制性定语从句与非限制性定语从句的翻译。
　　（6）关系词前有介词或复杂介词，关系词只能是which和whom。

　　（7）几个特殊的定语从句句型：
　　①He is the only one of the students who has got very good marks
　　in the match.（句中one为先行词）
　　He is one of the students who have got good marks in the match.（句中students为先行词）

　　②Is this place the one (that) we visited yesterday?
　　Is this the place(that / which)we visited yesterday ?
　　③He stood at the window, from where he could see what was happening.
　　④It may rain, in which case the match will be put off.