介词的用法1。表示地点位置的介词1)at ,in, on, to,forat (1)表示在小地方; (2)表示“在……附近,旁边"in (1)表示 在大地方; (2)表示“在…范围之内”。on 表示毗邻,接壤,“在……上面”。to 表示在……范围外,不强调是否接壤;或“到……”2)above, over, on 在……上above 指在……上方,不强调是否垂直,与 below 相对;over 指垂直的上方,与 under 相对,但 over 与物体有一定的空间,不直接接触。on 表示某物体上面并与之接触。The bird is flying above my head. There is a bridge over the river.He put his watch on the desk。3)below, under 在……下面under 表示在…正下方below 表示在……下,不一定在正下方There is a cat under the table.Please write your name below the line.4)in front [frant]of, in the front of 在……前面in front of…意思是“在……前面”,指甲物在乙物之前,两者互不包括;其反义词是 behind(在……的后面)。There are some flowers in front of the house.(房子前面有些花卉。)in the front of 意思是“在…..的前部”,即甲物在乙物的内部.反义词是 at the back of…(在……范围内的后部)。There is a blackboard in the front of our classroom。我们的教室前边有一块黑板。Our teacher stands in the front of the classroom.我们的老师站在教室前.(老师在教室里)5)beside,behindbeside 表示在……旁边behind 表示在……后面2.表示时间的介词1)in , on,at 在……时in 表示较长时间,如世纪、朝代、时代、年、季节、月及一般(非特指)的早、中、晚等。如 in the 20th century, in the 1950s, in 1989, in summer, in January, in the morning, in one’s life , in one’s thirties 等.on 表示具体某一天及其早、中、晚。如 on May 1st, on Monday, on New Year’s Day, on a cold night in January, on a fine morning, on Sunday afternoon 等。at 表示某一时刻或较短暂的时间,或泛指圣诞节,复活节等。如 at 3:20, at this time of year, at the beginning of, at the end of …, at the age of …, at Christmas, at night, at noon, at this moment 等。注意...