This is an attributive clause.

这是一个定语从句。

What is the attributive clause?

什么是定语从句？

This sentence is an attributive clause.

这个句子是定语从句。

Why should use English to write attributive clause?

为什么写英语要用定语从句？

Pay attention to the use of commas in the Non-restrictive Attributive clause.

注意逗号在非限制性定语从句中的用法。