摘要： I’d like to trek through the jungle, because I like exciting vacations. 我想去热带丛林中旅行.因为我喜欢充满刺激的假期. (1)辨析:through与across 二者都可译为“穿过 .但through是指从空间较狭窄的一头“穿 行到另一头.常指从事物内部穿过.含义与in有关系. across是指从一条线或某一事物的表面的一边到另一边.常可译为“横过 .“横穿 .含义与in有 关.例如: The train is running through the tunnel. 火车正从隧道中穿过. Two friends were walking through the forest when they met a bear. 两个朋友穿过一片森林时.突然遇到了一只熊. It’s dangerous to go across the road when traffic lights are red. 红灯亮时过马路很危险. In the picture, there is an Arab on the camel going across the desert. 那张画上.一个阿拉伯人骑在骆驼上正在过沙漠. (2)because是连词.连接一个原因状语从句.可置于句首.可放在主句后面表原因.because所表原因比较直接.要注意.so表结果.但在英语中却不能把because和so一起用于一个句子中表原因和结果.这 一点与汉语不同.例如: Helen is crying because she’s broken her mother’s necklace. = Helen has broken her mother’s necklace, so she is crying. 海伦把妈妈的项链弄坏了.所以在哭. I went to bed early because I was tired. = I was tired so I went to bed early. 我因为疲倦所以提早睡. (3)辨析:because, as, since, for <1>这四个词都是表示各种理由的连词.但because多表示所叙述的理由是本句的重点.故because所引导的从句多放于句末.例如: Why am I leaving? I’m leaving because I want to. 为什么我要离开?因为我想离开. <2>as, since用于表示理由是已知.而理由以外才是叙述的重点.两者皆多用于句首.但要注意: since更重形式.as多表示理由以外才是重点.例如: Since you have no license, you are not allowed to drive. 因为你没有驾驶执照.所以你不可以开车. As it is raining, let’s stay at home. 因为下雨.我们就留在家里吧. <3>for不用于句首.而用于主句之后.补充说明理由,主句表推测时.要用for说明理由.例如: I’ll follow his advice, for he is a doctor. 我会听从他的劝告.因为他是医生.

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