as引导限定性定语从句,主要用在such... as(正如)和the same as(正像)的结构中,可代替表人或物的先行词。
There is such an unforgettable experience as they have.
他们有着如此难忘的经历。
Nobody will obey such a rule as prevents us from free.
没有人会遵守这项阻止我们追求自由的规定。
I have never seen such a beautiful girl as she is.
我从来没有见过像她这样漂亮的女孩。
This is the same name as I have heard.
这个名字和我之前听过的一样。
as引导非限定性定语从句时,可放在主句之前,也可位于主句之后,当然也可放在句中。此时修饰的是整个主句,并对其进行说明。通常在as之前有逗号。
Thanksgiving day has been a international festival, as we know.
正如我们所知道的那样,感恩节已经成为了一个国际性的节日。
As is a successful man, he makes a brilliant speech.
他正如一个成功男士发表精彩的讲话。