介词
一.分类.
1.简单介词.in. at .on...
2.短语介词.be fond of. in need of. be good at .help sb with sth ...with the help of...
二.用法(不能单独做成分,必须和名词或代词连用做成分)
1.表语.he is in danger.
2.定语.the book on the desk is mine.
3.状语.class begins at 9:00.
4.宾补.make yourself at home.
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