初一介词讲解及练习介词：介词是虚词，不能独立充当句子成分介词短语能够充当句子成分介词短语 = 介词+介词宾语（名词、宾格代词、动名词等充当）根据词形，介词分为三类：1简单介词：in, on, from, at, for合成介词：upon, into, onto, inside, without成语介词：由两个以上单词合成。in front of, in the middle of, on top of一、 常用固定搭配的介词短语形式1. 动词 + 介词 look like; look at; talk to; think of 2. be + 形容词 + 介词 be surprised at; be afraid of3. be + 名词 + 介词 be mad at sb; the key to; the way to 4. 介词 + 名词 at work; at home; at school; at last; on the farm5. 介词 + 名词 + 介词 in front of; at the age o
