高中英语的定语从句，一定用as引导的定语从句有哪些情况，总是分不清，希望指导

-- as可以作为关系代词引导限定性定语从句、非限定性定语从句。例如：限定性定语从句 （常用于such … as和the same … as 等句式中）
Such points as you've mentioned are really important in solving the problem .
你提到的这些方面在解决这个问题上的确很重要。
People such as you describe are rarely seen nowadays .
你描述的这种人现在很少见了。
This computer has the same functions as that one has .
这台计算机有着和那台计算机一样的功能。
非限定性定语从句 （as可以作为关系代词引导非限定性定语从句时，as是指全句：也就是说，将整个主句看成一件事或是一个事实；并对其进行补充、说明。这种非限定性定语从句既可以放在主句之前，也可以放在主句之后。）
As I know , she hasn't got married . 如我所知，她还未结婚。
They won the first place in the game, as could be expected.
可以预料，他们在比赛中得了第一。
Professor Li is extremely popular among students , as is known to all of us . 如我们大家所知，李教授极受学生们的欢迎。