不好说 给你举例子吧非限制性定语从句中,先行词与定语从句往往有逗号隔开,非限制性定语从句相当于并列句,状语从句等.如He has two sons,who work in the same company.(he has only two sons)他有两个儿子,他们在同...He has two sons,who work in the same company.He has two sons who work in the same company.这就是啊另外的有I like computers,on which we can do a lot of things.非限制的定语从句I like computers on which we can do a lot of things.限制性定语从句