Question

非限定性定语从句和限定性定语从句的区别

Answer 1

形式上就是非限定性定语从句有逗号,限定性定语从句没有逗号

e.g.I visit the USA last year,during which I studied a lot.（非限定性定语从句）

I visit the USA which is a developed country .(限定性定语从句）