for[fC:,fE] prep. 1.为了：That’s what we’re here for. 这正是我们来的目的。2.给(某人)，供(某人)用：Here is a letter for you. 这是你的信。3.用于，用来：This knife is for cutting bread. 这把小刀是用于切面包的。4.因为，由于：You can’t see the wood for the trees. 你只见树木，不见森林。5.去：They set off for the shops. 他们买东西去了。6.达，计：I’m going away for a few days. 我要走开几天。7.对，对于：Reading in bed is bad for your eyes. 躺在床上看书对你的眼睛不好。8.适于，适合：Do you have any books for children? 你有适合小孩子看的书吗? 9.换，以…作交换：He gave her some magazines for her dictionary. 他用几本杂志换她的字典。10.作为，当作：He mistook a rope for a snake. 他把一条绳子误认为是蛇。11.支持，赞成：Are you for or against the plan？你是支持还是反对这个计划？12.就…来说，以…而言：He’s done well for a beginner. 作为新手，他干得很好。13.代表，代替：Red is for danger. 红色代表危险。14.(表安排的时间)在，于：The appointment is for 10:30. 约会定在十点半。15.尽管，虽然：For all his money, he’s a very lonely man. 他虽然富有，可是非常寂寞。16.(与不定式连用引出逻辑上的主语)：He spoke too fast for her to follow. 他说得太快，她跟不上。conj. 因为，由于：We can’t go for it is raining. 我们不能走，因为正在下雨。

【辨析】for, because, since, as的区别，见because。

forbid[fE5bid](forbade, forbidden) vt. 1.禁止，不许：Her father forbade their marriage. 她父亲不允许他们俩结婚。2.妨碍，阻止：High walls forbid all approach. 高墙遮断，难以接近。

【用法】1.后接动词要用动名词(不用不定式)：We forbid smoking during office hours. 我们不准在办公时间抽烟。2.虽不能接不定式作宾语，但可接不定式作宾语补足语：He forbade his wife to use his car. 他不准他妻子用他的车。

force[fC:s] vt.强迫，迫使：They forced him to give them the money. 他们强迫他给他们钱。2.强行，强加：You mustn’t try and force people into doing things they don’t want to. 不要强人所难。n. 1.[C, U] (自然)力，力量：The force of the explosion broke all the windows in the building. 爆炸的力量使这建筑物的全部窗户都破坏了。2. [U]暴力：The thief took the money from the old man by force. 那盗贼用暴力抢走了老人的钱。

forecast[fC:5kB:st] n. [C]预告，预测：The weather forecast said that it would snow today. 天气预报说今天要下雪。vt.预测，预报：The teacher forecast that 90% of his pupils would pass the examination. 老师预测他的学生中会有90%的通过考试。

forehead[fC:hed] n. [C]前额：I knew he was having a high fever by the feel of his forehead. 一摸他的前额，我就知道他在发高烧。

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