放句首或句中引导从句，只能用as(如例4,5);

　　从句在句末，无其他限制条件时，既可用which，也可用as(如例3)。

　　句型模式为：as …；主语＋ 谓语；主语， as…， 谓语；主语＋ 谓语，as/which… 10 3．从固定搭配角度：

　　在引导词＋be ＋done 结构中省略be时，只能用as(如例7)；

　　常见固定用法as is well known, as is often the case, as often happens, as has been said before, as has been pointed out, as can be seen等常用as(如例2,8 )。 4．从定语从句的肯、否定意义角度：

　　从句内容为否定意义时，常用which(如例6)。

　　其他情况可互换(如例3)。 10

　　填写定语从句的引导词 1. This is the teacher__________ I often ask advice on how to improve my English. 2. I have never come across such a situation ________ customers have to pay in cash. where　

　　where 11 关系副词where前面的先行词是否一定为地点名词？ 3. 0℃ is the freezing point ________ water turns into ice. 4. A party is an occasion ____________________ participants should dress formally. 5. This is a rare case_______ lost money can be found again.

　　where　

　　when / where/on which　

　　where 11 关系副词where前面的先行词是否一定为地点名词？

　　当先行词表达的意义为处所，程度，状态，情况时，引导词的确定需要采用“还原搭配”原则。上述五个定语从句可还原为： 　 1. I often ask advice on how to improve my English from the teacher. 　 2. Customers have to pay in cash in such a situation. 　 3. Water turns into ice at the freezing point. 11

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