forDo not use for before a to-infinitive to say what the purpose of an action is. Use in order to , or just a to-infinitive.表示某一行为的目的时,不要将for用在带to的不定词之前,而要用in order to或直接用不定式•They wanted to raise money in order to build up the business (NOT不用 ... for to build up the business). 他们想筹集资金创业。•She went downtown to do some shopping. 她去市中心购物。ofTo refer to someone or something that belongs to or is connected with someone, it is usual to use -’s or-s’, not of, with short noun phrases. 指某人或某物属于某人或与某人有关时,通常用-’s或-s’接短的名词短语,而不用ofWhen referring to one of several people or things belonging to or connected with someone, or when using ‘this’ or ‘that’, use of mine/yours/his/hers/ours/theirs. 提到多个人或物中的一个属于某人或与某人有关时,或用到this或that时,要用of mine/yours/his/hers/ours/theirsTo talk about the person who sang, wrote, or painted a particular work, use by, not of. 谈论某个作品由某人所唱、所写或所画时,用by,而不用of•Dad’s car (NOT 不说 the car of Dad) 爸爸的汽车•a child’s bike (NOT 不说 the bike of a child) 孩子的自行车•my sisters’ boyfriend (NOT 不说 the boyfriend of my sister) 我姐姐的男朋友•the miners’ strike (NOT 不说 the strike of the miners) 矿工的罢工•a friend of mine (NOT 不说 a friend of me) 我的一位朋友•that car of yours (NOT 不说 that car of you) 你的那辆汽车•a song by Mariah Carey (NOT 不说 of Mariah Carey) 玛丽亚•凯莉唱的一首歌