文档介绍：类别 1类别 1? 1. for ?义为:因为,由于…的缘故;既然; 鉴于…? You'd better put on your sweater, for it's rather cold outside. 你最好把毛衣穿上,外边相当冷。? He felt no fear, for he was a brave man. ?他不感到害怕,因为他是个勇敢的人。? Comfort him for he is sad. ?去安慰他,因为他很悲伤。[比 because 较为正式,少用于口语中, 用于提出证据或说明前面刚作的陈述] ?判断改错: (错) For he is ill, he is absent today. (对) He is absent today, for he is ill. for 是并列连词,不能置于含两个并列分句的句子的句首,只能将其放在两个分句中间。?比较 since 和 for Since 用来说明动作起始时间, for 用来说明动作延续时间长度。 I have lived here for more than twenty years. I have lived here since I was born.. My aunt has worked in a clinic since 1949. ? Some new oilfields have been opened up since 1976. I have known Xiao Li since she was a little girl. My brother has been in the Youth League for two years. I have not heard from my uncle for a long time. ?注意:并非有 for 作为时间状语的句子都用现在完成时。 I worked here for more than twenty years. (我现在已不在这里工作。) I have worked here for many years. (现在我仍在这里工作。) ? 小窍门: 当现在完成时+一段时间,这一结构中, 我们用下面的公式转化,很容易就能排除非延续动词在完成时中的误使。 1)(对) Tom has studied Russian for three years. = Tom began to study Russian three years ago, and is still studying it now. 2)(错) Harry has got married for six years. = Harry began to get married six years ago, and is still getting married now. 显然,第二句不对,它应改为 Harry got married six years ago. 或 Harry has been married for six years. ? ? 1. 因为,由于: The boy was always late because it took so long to get dressed. ?这个男孩因花太长时间穿衣服总是迟到。? I can't do it now because I am busy. ?因为我正忙着,现在不能做此事。? 2. [ 用于引导一个名词从句,相当于 that 或 the fact that] …这一事实, …这一点原因,原因是: The reason I am here is because I want to ask for your help. ?我之所以到这儿来是想寻求你的帮助。? 3. [ 用于省略句,表示暂不便说明详细理由]: I think it would make her feel better because. ?我想它会使她觉得好受些。原因嘛, 现在不说。? Because of ? But in over weight overweight people, it can look yellow because of fat. ?但是在超重的人中,因为脂肪它可能看起来是黄色的。? Because of this, you sometimes can use contrails to predict the weather. ?因为原理,你有时候可以用这条轨迹来预测天气。