英语介词是让我们英语学习者感觉最为头疼的部分，虽然介词本身都非常简单易学，我们很容易就能够记住介词的读音和拼写，但是介词的用法却非常复杂，不易掌握，每个介词都有不同的用法，用于修饰时间、地点，方向等或者与不同的动词、名词搭配表达不同的含义，瀚森教育英语名师根据多年教学经验，为大家全面解析介词for的用法，介词for 主要用于表示某人或某事与什么有关，或有益于谁；表示目的，原因或目的地；修饰表示时间、地点或数量；表达希望或支持等，具体用法如下：
第一、介词for表示某人或某事与什么有关，或有益于谁（SAYING WHO OR WHAT SOMETHING RELATES TO, OR WHO BENEFITS）
1. PREP If something is for someone, they are intended to have it or benefit from it. 为
（1) Isn't that enough for you? 那对你来说不够吗？
（2) ...a table for two. …一张双人桌。
（3) He wanted all the running of the business for himself. 他想要自己管理整个企业。
2. PREP If you work or do a job for someone, you are employed by them. 为… (工作)
（1) I knew he worked for a security firm. 我知道他为一家保安公司工作。
（2) Have you had any experience writing for radio? 你有为电台撰稿的经验吗？
3. PREP If you speak or act for a particular group or organization, you represent them. 代表 (某团体或机构)
例：She appears nightly on the television news, speaking for the State Department.
她每晚出现在电视新闻上，代表国务院发言。
4. PREP If someone does something for you, they do it so that you do not have to do it. 替… (做事)
（1) If your pharmacy doesn't stock the product you want, have them order it for you. 如果药房没有你所要的产品，让他们替你订货。
（2) I hold a door open for an old person. 我替一位老人把门开开。
5. PREP If you feel a particular emotion for someone, you feel it on their behalf. 替… (感到) [adj/n PREP]
例：This is the best thing you've ever done – I am so happy for you! 这是你做过的最好的事–我真为你高兴！
6. PREP If you feel a particular emotion for someone or something, they are the object of that emotion, and you feel it when you think about them. 对… (常怀有某种感情) [adj/n PREP]
例：John, I'm sorry for Steve, but I think you've made the right decisions.
约翰，我为史蒂夫感到难过，但我想你作出了正确的决定。
7. PREP You use for after words such as "time," "space," "money," or "energy" when you say how much there is or whether there is enough of it in order to be able to do or use a particular thing. 供…使用
（1) Many new trains have space for wheelchair users. 许多新火车都为坐轮椅者留有空间。
（2) ...a huge room with plenty of room for books. …可存放大量书籍的一间大屋子。
8. PREP You use for when you make a statement about something in order to say how it affects or relates to someone, or what their attitude to it is. 对…来说
（1) What matters for most scientists is money and facilities. 对大多数科学家来说，重要的是经费和设备。
（2) For her, books were as necessary to life as bread. 对她来说，书就像面包一样是生活的必需。
9. PREP After some adjective, noun, and verb phrases, you use for to introduce the subject of the action indicated by the following infinitive verb. 用于某些形容词、名词或动词词组之后，引出动词不定式的执行主语 [PREP n to-inf]
（1) It might be possible for a single woman to be accepted as a foster parent. 有可能接受单身女子做养母。
（2) I had made arrangements for my affairs to be dealt with by one of my children. 我安排了自己的一个孩子处理我的事务。
10. PREP If you say that something is not for you, you mean that you do not enjoy it or that it is not suitable for you. 不被…喜欢; 不适合 [非正式] [with neg]
例：Wendy decided the sport was not for her. 温迪认定这项运动不适合她。
11. PREP If it is for you to do something, it is your responsibility or right to do it. 由… (负责) [PREP n to-inf]
例： I wish you would come back to Washington with us, but that's for you to decide.
我希望你和我们一起回华盛顿，但由你自己决定。
12. PREP For is the preposition that is used after some nouns, adjectives, or verbs in order to introduce more information or to indicate what a quality, thing, or action relates to. 用于某些名词、形容词或动词之后，引出更多信息或指出相关的性质、事物、行为等
（1) Reduced-calorie cheese is a great substitute for cream cheese. 低卡路里干酪是奶油干酪的极好替代品。
（2) Parking lot owners should be legally responsible for protecting vehicles. 停车场场主应该依法负责保护车辆。
13. PREP If a word or expression has the same meaning as another word or expression, you can say that the first one is another word or expression for the second one. (意思) 相当于
例：The technical term for sunburn is erythema. 晒斑的专业术语是红斑病。
14. PREP To be named for someone means to be given the same name as them. 以… (命名) [美国英语]
例：The Brady Bill is named for former White House Press Secretary James Brady.
布雷迪法案是以前白宫新闻秘书詹姆斯·布雷迪命名的。
15. PREP You use for in a piece of writing when you mention information which will be found somewhere else. 至于… (用于指可以在文中其它地方找到的信息)
例：For further information on the life of William James Sidis, see Amy Wallace, "The Prodigy."
要了解更多关于威廉·詹姆斯·西迪斯的生平，参阅艾米·华莱士的《神童》。
16. PREP For is used in conditional sentences, in expressions such as "if not for" and "were it not for," to introduce the only thing which prevents the main part of the sentence from being true. 要不是
（1) If not for John, Brian wouldn't have learned the truth. 要不是约翰，布莱恩不会了解真相。
（2) The earth would be a frozen ball if it were not for the radiant heat of the sun. 要是没有太阳的辐射热，地球将会是一个冰冻的球体。
第二、介词for用于表示目的，原因或目的地（MENTIONING A PURPOSE, REASON, OR DESTINATION）
1. PREP You use for when you state or explain the purpose of an object, action, or activity. 为了 (表示目的、用途) [PREP n/-ing]
（1) ...drug users who use unsterile equipment for injections of drugs. …用未消过毒的器具注射毒品的吸毒者们。
（2) The knife for cutting sausage was sitting in the sink. 用于切香肠的刀在水槽里。
2. PREP You use for after nouns expressing reason or cause. 因为 (作介词，用于表示原因的名词后) [n PREP n/-ing]
（1) He's soon to make a speech explaining his reasons for going. 他很快将会发表讲话说明去的原因。
（2) The county hospital could find no physical cause for Sumner's problems. 县医院查不出萨姆纳的问题的生理原因。
3. PREP If something is for sale, hire, or use, it is available to be sold, hired, or used. 供 (销售、租用、使用)
（1) Freshwater fish for sale. 供出售的淡水鱼。
（2) ...a room for rent.…一间供租用的房间。
4. PREP If you do something for a particular occasion, you do it on that occasion or to celebrate that occasion. 为 (某场合)
例：He asked his daughter what she would like for her birthday.
他问他女儿想要如何过她的生日。
5. PREP If you leave for a particular place or if you take a bus, train, plane, or boat for a place, you are going there. 前往 (某地)
例：They would be leaving for Rio early the next morning.
他们次日一早将前往里约。
第三、介词for用于修饰数字、数量和时间（ BEFORE NUMBERS, AMOUNTS, AND TIMES）
1. PREP You use for to say how long something lasts or continues. 用于表示持续的时间 [PREP amount]
（1) The toaster was on for more than an hour. 烤箱开了一个多小时。
（2) They talked for a bit. 他们谈了会儿。
2. PREP You use for to say how far something extends. 用于表示延伸的距离 [PREP amount]
例：We drove on for a few miles. 我们继续开了几英里。
3. PREP If something is bought, sold, or done for a particular amount of money, that amount of money is its price. 以 (某数量的钱) [PREP amount]
（1) We got the bus back to Tange for 30 cents. 我们以30美分乘公共汽车回到了坦。
（2) The Martins sold their house for about 1.4 million dollars. 马丁一家以约一百四十万美元把他们的房子卖了。
4. PREP If something is planned for a particular time, it is planned to happen then. 于 (某时间)
（1) ...the Baltimore Boat Show, planned for January 21 – 29. …计划于1月21至29日举行的巴尔的摩船展。
（2) The designer will be unveiling her latest fashions for autumn and winter. 该设计师将公布她的最新款秋冬时装。
5. PHRASE You use expressions such as for the first time and for the last time when you are talking about how often something has happened before. 首次/最后一次
例： He was married for the second time. 他第二次结婚了。
6. PREP You use for when you say that an aspect of something or someone is surprising in relation to other aspects of them. 对…来说
例：He was tall for an eight-year-old. 对一个8岁的孩子来说他长得很高。
7. PREP You use for with "every" when you are stating a ratio, to introduce one of the things in the ratio. 对于 (与every连用，用于引出比率中之一)
例：For every farm job that is lost, two or three other jobs in the area are put at risk.
对于失去的每份农场工作，该地区的其它两三个工作就会被置于危险中。
8. PREP You can use for in expressions such as dollar for dollar or mile for mile when you are making comparisons between the values or qualities of different things. 对应 (用于比较不同事物间的价值或品质) [n PREP n]
例： ...the Antarctic, mile for mile one of the planet's most lifeless areas.
…每英里都是地球上最无生命的地区之一的南极洲。
第四、介词for用于表示渴望或支持（WANTING OR SUPPORTING）
1. PREP If you say that you are for a particular activity, you mean that this is what you want or intend to do. 想要
例： Right, who's for a toasted sandwich then? 好了，那谁想要一个吐司三明治呢？
2. PREP If you are for something, you agree with it or support it. 赞成; 支持
例：Are you for or against public transportation? 你是支持还是反对公共交通？
3. PREP You use for after words such as "argue," "case," "evidence," or "vote" in order to introduce the thing that is being supported or proved. 支持 [n/v PREP n]
（1) Another union has voted for industrial action in support of a pay claim. 又一个工会已投票赞成支持加薪要求的劳工行动。
（2) The case for nuclear power is impressive. 支持核能的论据令人印象深刻。
4. ADV For is also an adverb. 支持地 [ADV after v]
例：833 delegates voted for, and only 432 against. 833名代表投票支持，只有432人反对。
5. PHRASE If you say that you are all for doing something, you agree or strongly believe that it should be done, but you are also often suggesting that other people disagree with you or that there are practical difficulties. 完全赞成; 极力支持
例：He is all for players earning what they can while they are in the game.
他完全赞成运动员在役期间能赚多少钱就赚多少。
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