1. 表示年、月、日时刻等用at，in，on1）at 用于表示时刻、时间的某一点 at noon , at night , at present , at 8 o'clock eg: We usually have lunch at 12. 2）on 用于某天，某天的上、下午（指具体某一天时，一律用on） on Monday , on Tuesday morning , on June 12th , on a cold night , on the night of May 1st eg: We didn't listen to the lecture on Friday afternoon. 3）in 用于表示周、月、季节、年，泛指的上午、下午、晚上 in the week , in May , in spring , in 1992 , in the morning , in the afternoon , in the night eg: People go skating in winter. 2. 表示时间的前后用before，after1) before 在...之前 eg: Wash your hands before dinner. He will call me before he leaves here. 2) after 在...之后 eg: Let's sing some songs after school. Please close the door after you leave the room. 3. 表示期限等用by，untill，till1) by 在...之前;截至... eg: How many English books had you read by the end of last year. 2) untill(till) 直到...为止 (untill 与 till 可通用) eg: We didn't begin to watch TV untill (till) nine o'clock. I'll wait for him untill he comes here. 4. 表示期间等用for，during，through1) for 达...之久 eg: He has lived here for 20 years. We will stay in the city for two days. 2) during 在...期间 eg: They are going to have a good rest during the summer holidays. 3) through 一直...(从开始到结束) eg: They played the cards through the night. 5. 表示时间的起点等用from，since1) from 从...起(时间) eg: The meeting will be held from eight to ten. The meeting will be held at eight 2) since 自从...以来(表示从以前某时一直到现在仍在继续) eg: I have been sick since yesterday. The doctor has saved a lot of lives since he became a doctor.
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with,without,before,between,except,and,qr^……还有很多啦，书后的单词表里有，音标后注有“prep.”的就是介词。
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介词很多，有：指地点、时间、方位、范围.......
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