from.1从...起,始于 She is singing from morning to night.她从早唱到晚.2离(开) Our school is two miles from the station.我们学校离车站两英里.3从...来;出自 He comes from Shanghai.他来自上海.4(表示原料)由 Flour is made from wheat.面粉由小麦制成.to:1prep.1.向,往,到 She lives in the house to the right.她住在右边的房子里.This road leads to Paris.这条路通往巴黎.2 (表示时间)直到,在...之前 He wrote from morning to night.他从早到晚写东西.3 趋于;(变)成,(变)到 Things are going from bad to worse.4(表示对象)对,向 Excessive drinking did harm to his health.过量饮酒损害了他的健康.5(与原形动词一起构成不定式) It's very important for us to study English well.6 (用来代替不定式或不定式短语,以免重复) You can do it this way if you want to.如果你乐意的话,可以这样做.一般的上午、下午或晚上,季节以及月或年一般用in；in January 在一月,in winter在冬季,in 1999 在1999,in the morning(afternoon,evening).在上午（下午,晚上） in a week 在一周内 如:We watch Tv in the evening．我们晚上看电视.用某种语言 in English 穿着 in red We can tell the story in English.我能用英语讲述这个故事.The girl is in red.这个女孩子穿着红衣服.on指在某一天或某一天的上午,下午,晚上,如：on Monday,在星期一 on Sunday afternoon 在周日下午,on July 1,1999 在1999年7月日 on Monday 在周一 on Monday afternoon 在周一下午 on March 7th 在3月7日 on March 7th,1998.在1998年3月7日 on the morning of March 7th,1998.在1998年3月7日上午 表示时间和年龄用at;at six o’clock,at half past three .习惯用法：at night,at noon 比如 I get up at six in the morning．我早上6点钟起床.He got married at the age of 25．他25岁结婚.