3. 定语从句
定语是指在句子中用来修饰名词、代词的成分。
如：I will give my teacher a bunch of beautiful flower.
定语从句是指在一个句子中作定语的句子，定语从句要放在所修饰的词后
如：I have met the doctor who is in the No.1 hospital.
定语从句的连接词：
连接代词：who、which、whom、whose、that
连接副词：when、where、why
-->
