介词短语 - 介词 prep.
时间
before after
since until
during
位置
between（二者之间） among（三者及以上）
地点方位
across(横穿) through(隧道)
against
like as
非谓语动词
doing（主动）
Passing planes can be heard night and day.The teacher came into the classroom, holding a book in his hand.
done（被动）
He bought a used car.The teacher came into the classroom, followed by five students.
to do（目的）
I am coming to see you.I have a lot of homework to do.
同位语/插入语
My teacher, Mr.Lee, is coming to the meeting.
My teacher together with his colleagues is coming to the meeting.
