for:(1) prep.（表示时间、距离）计,达 word that shows how far or how long [例句] I have waited for three hours.我等了三小时.For much of the time he suffered from bad health.在很长时间里,他身体都不好.They were silent for a while.他们沉默了一会儿.It's time for little girls to be in bed.小女孩就寝的时间到了.We walked(for) a mile and ran (for) a mile.我们走了一英里,又跑了一英里.(2) prep.开往,向 word that shows where someone or something is going [例句] She left Tianjin for Beijing.他离开天津上北京去了.Is this the train for Glasgow?这是开往格拉斯哥的火车吗?(3) prep.给,与,适于 word that shows who will get or have something [例句] This is a present for you.这是给你的礼物.(4) prep.当作 as; as being [例句] I took him for his brother.我把他当作是他的兄弟.(5) prep.因为,由于 by reason of,on account of; because of [例句] We could not see for the fog.因为有雾,我们看不见.They did not draw the conclusion for the following reason.由于下述理由他们没有作出结论.He was punished for stealing.他因偷窃而受惩处.(6) prep.就…而言 word that shows whom you are talking about [例句] It is dangerous for a small child to cross the road alone.小孩子自己过马路危险.It's for you to decide.这件事由你来决定.He is tall for his age.他小小年纪,个子倒挺高.（就他的年纪来说,他的个子算是高的.） (7) prep.为了,供 word that shows why you are doing something [例句] It is very cold for October.十月里这样的天气真是很冷.I have got some picture books for you to look at.我有一些让你看的书.No house was big enough for him to live in.没有那么大的房子可供他住.We work hard for socialism.我们为社会主义努力工作.(8) prep.（比赛或战斗时）代表,代,替 on the same side in a sport or fight [例句] They would run for the United States.他们将代表美国去参加赛跑.Tim plays tennis for his school.蒂姆代表学校参加网球赛.(9) prep.价格,交换 word that shows how much something is [例句] I want to change this for that.我想用这个换那个.I paid two dollars for the book.为这本书我付了两元钱.I gave 5 pounds for it.我出五英镑买的.(10) prep.赞成,支持 word that shows you like an idea [例句] Are you for or against the proposal?你是赞成这个建议还是反对这个建议?Some people were for the strike and others were against it.有些人赞成罢工,另一些人反对.(11) conj.因为 because; on account of the fact that [例句] I am thirsty,for the sun is hot.我由于天热而口渴.I missed the beginning of the play,for I was late.我没有看到话剧的开头部分,因为我迟到了.about:(1) adv.大约；差不多 a little more or less than; nearly [例句] We waited for about twenty minutes.我们等了差不多二十分钟.(2) adv.几乎一样；近于 almost exactly [例句] Peter is about as tall as John.彼得几乎和约翰一般高.(3) adv.在附近某处；不远 somewhere near; not far away [例句] Is the manager about?经理在（附近）吗?(4) adv.到处；各处 here and there; in different ways or places [例句] The children were running about in the rain.孩子们在雨中跑来跑去.He is always leaving his papers about.他总是把文件到处乱放.(5) prep.附近；周围；各处 around; here and there [例句] There were a lot of flowers about the house.房子周围有许多花.Their house is about here on the map.从地图上看他们房子在这附近.He planted trees about the house.他种树于屋子四周.I dropped the key somewhere about here.我把钥匙失落在这个地方附近.We walked about the town.我们在城里到处走动.(6) prep.关于；有关 of,on the subject of [例句] What's he so angry about?他恼怒什么?Her mother was anxious about her.他母亲挂念她.The story is about giants.这是关于巨人们的故事.They're full of good advice about reading.那里边尽是关于阅读的金玉良言.I read about it in the newspaper.关于那件事我是在报纸上看到的.Are you talking about me?你们在谈论我么?I want to ask about the train time table.我要查询一下火车行车时间表.(7) prep.（时间）近于 a little before or after a time [例句] Come about six p.m..下午六点左右来.He left there about ten o'clock.他大约在十点钟离开了那里.