介词短语和连词用什么区别？举例解释，谢谢合作

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.

连词

连词是一种虚词， 它不能独立担任句子成分而只起连接词与词，短语与短语以及句与句的作用。连词主要可分为两类：并列连词和从属连词。并列连词用来连接平行的词、词组和分句。如：and, but, or, nor, so, therefore, yet, however, for, hence, as well as, both…and, not only…but also, either…or, neither…nor, (and)then等等。

介词加宾语 连词连句子
拿since举例
当介词时：He has been here since Monday.
当连词时：How long is it since you came to China？