摘要: as 引导非限制性定语从句.一般不指代某个具体的名词或代词.而是代表整个主句或主句的一部分.这种从句可放在主句之前.也可以放在主句之后.有时还可以放在主句的中间.如: As is reported in the newspapers, talks between the two countries are making progress. 正如在报纸上所报道的.两国间的谈判有所进展. Grammar is not a set of dead rules, as has been said above. 如上所说.语法不是一套死条文. Spiders are not insects, as many people think, nor even nearly related to them. 蜘蛛不是昆虫.尽管许多人都这样认为.它甚至与昆虫几乎没有联系.

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