介词+名词(指方位的,地点的,物品):at school，at home,on the desk
介词+动名词:He is good at playing football.
介词+表示时间的词:in the morning ; at noon
介词+人名:Except Mr.Wang,we went to see the film.
介词+名词性短语:The composition is very good except for a few spelling mistakes.
介词短语在句子中的语法功能是:
1.定语.如:The key to the door is missing.
2.状语.如:They are playing basketball on the playground.
3.表语.如:Japan is to the east of China.
4.宾语补足语.如:We consider education of great importance.
5.主语补足语.如:These machines must be kept in good cindition.
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