除了逗号之外,和限制性定语从句最主要的区别是:
1) 非限制性定语从句,其关系代词不能是that, 只能用who,which ,这个是最关键的。
例如: The car , that I bought yesterday, is a pick-up 就是错的。应该是:
The car, which I bought yesterday, is a pick-up.
2)非限制性定语从句是对先行词的补充说明,这种说明可以替换,不具有唯一性。而限制性定语从句对先行词具有限定性。例如:My bike which was given by my brother as a gift got missing.