非限定性定语从句中which与as的用法有何区别？
推荐回答（2个）
1、as引导的定语从句可以放在句首、句中和句尾，which引导的定语从句只能放在句尾。 2、当as后面有“is或was+过去分词”构成的被动语态时，助动词is或was可省略。
3、as有时也可用作关系代词 。as引导非限制性定语从句，若as在从句中作主语，其引导的句子可以放在句首，也可以放在句中。但which引导的非限制性定语从句只能放句中。
例句： As is reported in the newspaper ，some artistic treasures(艺术珍品） will be on show at the exhibition on the weekend.
as和which在引导非限制性定语从句时 都可以指代整个一句话。
as从句位置比较灵活 置前 置中 置后 都可以 而which只能放在后面
如果意思是 正如。。。，正像。。。就用as
如果意思意思是 这一点 这。。。就用which
位置记住 意思分清 as和which引导非限定从 且指代整句话 时 的 区别就清楚了。
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