一、根据形式分类

1.简单介词

（1）普通介词 at，by，for，in，over，to，up

（2）合成介词 onto，into，within，without

（3）分词介词 concerning，considering，including，regarding

2.双重介词

at about　　　　except for　　　　　from across　　　from among　　　from behind

from beyond　　 from inside　　 　　from throughout　from under　　　in between

since before　　until after/before　up to　　　　　　up until

3.短语介词

according to apart from because of by means of due to

in addition to in case of in front of in place of in spite of

instead of on behalf of out of with reference to with regard to