副词修饰动词,形容词修饰名词代词,介词后面接名词代词构词介词短语可以做表语,定语,状语,表示时间地点,方位,.
careful 形容词 she is careful .She is a careful student.
carefully 副词 She studies carefully.
in 介词 in the classroom
we are in the classroom.表语
We had a party in the classroom.地点状语
The students in the classroom are all good students.定语