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as 引导的非限定性定语从句
as 引导的非限定性定语从句位置比较灵活，可放在句首，句中或句末，一般以逗号与主句分开，用来指代整个主句。as 与 which 引导非限定性定语从句的区别：
1）非限定性定语从句在句首时，只能用 as ，不能用 which。例如：As is generally accepted, economic growth is determined by the smooth development of production.
2）非限定性定语从句位于主句之后，纯粹表示主句所述内容，不带有“如...那样”的意思时，用 which，不用 as。例如：They are invited to the state banquet, which was a great honor to them.
3）当非限定性定语从句的关系代词指的是先行词本身时，只能用 which，不能用 as。例如：The west lake, which is one of the world famous scenic spots, is in Hangzhou。
