用中文直译 of:的,之,所属... She's one of my friends. on:在..之上,与..相关 Books are on the table. in:在..里面,在..范围内 My father works in a fctory. for:为了.., ...的 I cried for the match yesterday. were:are的过去分词,"是"的意思,在虚拟语态里也可以跟IThey were classmates 3 years ago. did:do的过去分词,意思是做,干。 I didn't water the flowers yesterday.关于后面那个问题,是这样解释的:were you at home last saturday ? 在表述位置时,结构应为 名词+谓语+介词+宾语比如 she is in the classroom. 介词前谓语必须是 am is are 或它们的不同时态 比如was和were 不能是do或did这类实意动词did you go there by bike?这里实际有含义的动词是go,而且是一般过去式,像 I didn't know you一样。这里did是助词,如果由were引导,就变成过去进行式,比如were you going there?