(1) 简单介词：about, after, before, but, by, for, in, like, near, under, up等。
(2) 复合介词(由两个介词组成)：inside, into, throughout, upon, within, without等。
(3) 短语介词(由短语构成)：according to, apart from, except for, for the sake of, in case of, inpite of, in view of, on behalf of, owing to, prior to , with regard to, with reference to等。
(4) 分词介词：concerning, considering, excluding, following, including, regarding等。
