Chaucer is buried in “Poet’s Corner”，as might have been expected.?

正如人们已经预料的，乔叟被葬在“诗人角”。?

The material is elastic，as is show in the figure.这种材料有弹性，如图所示。?

as we know众所周知?

as has been said above/before正如前文所述?

as has been pointed out正如已经指出的?

as might be imagined可以想像得到?

当定语从句的关系代词指的是先行词本身时，只能用which。如：?

These apple trees，which I planted three years ago，have not borne any fruit.?

这些苹果树是我三年前种下的，没结出任何果实。?

The Thames，which is now clean enough to swim in，was polluted for over a hundred years.?

泰晤士河，现在已经很干净，可以在里面游泳，它曾被污染了一百多年。?

带介词的典型的定语从句，必须用which，不能用as。如：?

There is a great deal of oxygen around us，without which we could not live.我们周围有许多氧气，没有它我们就无法生存。?

The shed in our garden，in which we often played，has lasted for a long time.?

我们经常玩耍的花园里的那个棚子，已经有很长时间了。?

2)引导限制性定语从句时which与as的区别：?

先行词如为表示物的名词或代词，在从句中又作介词的宾语时，只能用which。如：?

This is the pan in which I boiled the milk. 这就是我煮牛奶的锅。?

前面有as时,引导定语从句的关系代词用as，不用which。如：?

There are as many dictionaries as are needed.所需要的字典都有了。?