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：

　　I saw him as he was getting off the bus. 当他下公共汽车的时候我看见了他。

　　The boy was singing a popular song as he was bicycling. 这男孩边骑车边唱歌。

　　As she grew older, she became less active. 当她长大一点的时候，就变得不那么活泼了。

　　三、as作为从属连词引导原因状语从句

　　as 引导的原因状语从句常放在主句前，表示因为，由于。如：

　　As she is a model teacher, she gives a good example to others. 因为她是一名模范教师，她给其他人树立了一个好的典范。

　　As he wasnt ready in time, we went to the cinema without him. 由于他没有及时准备好，我们就去看电影了，没有等他。

　　三、as作为从属连词，引导让步状语从句

　　as引导让步状语从句比较特别，它要求将主语和谓语或谓语的一部分倒装。如：

　　Old as he is, he is still full of energy. 尽管年纪大了，但他依然精力充沛。

　　Try as she may, she never succeeds. 尽管她很努力，但总是不成功。

　　Much as I admire Mr. Wang as a poet, I dont like him as a man. 尽管我喜欢王先生的诗歌，但我不喜欢他的为人。

　　注：当倒装后置于句首的名词为单数可数名词时，习惯上不带冠词。如：

　　Boy as he was, he was made king. 尽管他还是个孩子，却被立为国王了。

　　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：

　　I saw him as he was getting off the bus. 当他下公共汽车的时候我看见了他。

　　The boy was singing a popular song as he was bicycling. 这男孩边骑车边唱歌。

　　As she grew older, she became less active. 当她长大一点的时候，就变得不那么活泼了。

　　三、as作为从属连词引导原因状语从句

　　as 引导的原因状语从句常放在主句前，表示因为，由于。如：

　　As she is a model teacher, she gives a good example to others. 因为她是一名模范教师，她给其他人树立了一个好的典范。

　　As he wasnt ready in time, we went to the cinema without him. 由于他没有及时准备好，我们就去看电影了，没有等他。

　　三、as作为从属连词，引导让步状语从句

　　as引导让步状语从句比较特别，它要求将主语和谓语或谓语的一部分倒装。如：

　　Old as he is, he is still full of energy. 尽管年纪大了，但他依然精力充沛。

　　Try as she may, she never succeeds. 尽管她很努力，但总是不成功。

　　Much as I admire Mr. Wang as a poet, I dont like him as a man. 尽管我喜欢王先生的诗歌，但我不喜欢他的为人。

　　注：当倒装后置于句首的名词为单数可数名词时，习惯上不带冠词。如：

　　Boy as he was, he was made king. 尽管他还是个孩子，却被立为国王了。