2023中学英语定语从句：as作关系代词引导的定语从句思维导图

He used such expressions as he could find in the texts. 他使用在课文中可以找到的那些词语。 
They stayed for the night in the same room as they had once rented.他们在他们曾租用过的同一房间过夜。 
注意：在the same…后也可用that引导定语从句，但含义有所不同。that引出的从句，指的是与先行词同一的事物，而as引导的从句指的是与先行词同类的事物。例如： 
This is the same bag as I lost yesterday.这个包和我昨天丢失的包的样子是同样的。 
This is the same bag that I lost yesterday.这就是我昨天丢失的那个包。

例如： 
As is known to everybody, the moon travels round the earth once every month.正如大家所知道的那样，月球每月绕着地球转一圈。 
He wasn’t unconscious, as could be judged from his eyes.他并未失去知觉，这从他的眼神可以看出来。

注意：as, which引导非限制性定语从句的区别：