1.介系词是用在名词或其同等语之前,表示该名词或其同等语和句中其他成分之间关系的字.介系词是虚字,不能单独充当句子成分. I am concerned about her health? 我对她的健康感到担忧. about是介系词. 2.在介系词后的名词或其同等语是介系词的受词. There is an apple on the table. 桌子上有一个苹果. the table是介系词on的受词. 3.介系词从形式上来分有四种. 类别1:只有一个字的简单介系词.如: at,before,for,from,in,next,of,over,since,to,under,with 类别2:由两个字合成的合成介系词.如: inside,into,out of,outside,upon,within,without 类别3:由两个介系词组成的双重介系词.如: from among(从...当中),from behind(从...后面),till after(直到...之后). 类别4:由两个或多个单字组成的片语介系词.如: at the end of(在...最后),according to(根据),because of(由于),by means of(以...为手段),in case of(万一),in need of(需要),in front of(在...之前),in spite of(尽管...还是),instead of(代替),owing to(由于).
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