插入语，例如：All of us, in fact， love our teacher.
同位语，例如：Ms.Li, the teacher of our class, is very friendly.
从句，例如：Our teacher, which is very friendly，comes in.
差不多就这几种吧，例子随便举的，可能举得不太好，有什么疑惑继续问我就是。
插入语
