初中英语语法之二十二介词
22.1介词(preposition)：也叫前置词。
在英语里，它的搭配能力最强。但不能单独做句子成分需和名词或代词（或相当于名词的其他词类、短语及从句）构成介词短语，才能在句中充当成分。
介词的种类：
（1）简单介词：about, across, after, against, among, around, at, before, behind, below, beside, but, by, down, during, for, from, in, of, on, over, near, round, since, to, under, up, with等等。
（2）合成介词：inside, into, outside, throughout, upon, without, within
（3）短语介词：according to, along with, apart from, because of, in front of, in spite of, instead of, owing to, up to, with reguard to
（4）分词介词：considering, reguarding, including, concerning
介词短语：
构成 例句
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