一、as用作关系代词引导定语从句
1. 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。
2. as 引导限制性定语从句,主要用于the sameas(与相同),suchas(像一样),asas(与一样)。如:
She knew he felt just the same as she did. 她知道他的感受和她一样。
Such a man with a good temper as Mr. Li is is easy to get along with. 像李先生这样好脾气的人是容易相处的。
He smokes as expensive a cigarette as he can afford. 他抽一种他买得起的最贵的烟。
二、as作为从属连词引导时间状语从句
表示当的时候或一边一边,强调主句的动作和从句的动作同时发生。如:
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