条件状语从句（高考卷中常见）
条件状语从句表示条件， 现将其在高考卷中的常见引导词介绍如下：1. if 表示正面的条件， 意为“如果”； unless (=if not) 表示负面的条件， 意为“除非， 如果不”。例如： If you ask him, he will help you. 如果你请求他， 他会帮助你。// If you had come a few minutes earlier, you would have met him. 要是你早来几分钟就碰到他了。(本例句属于第8章中介绍过的以虚拟语气表示非真实条件句的情况。) // He is sure to come unless he has some urgent business. 他一定会来， 除非他有急事。
2. in case， on condition that， providing， provided (that)， supposing， suppose (that)等词汇意思相近， 指“假如， 假使， 在……条件下”(比if更为书面化)。例如： In case he comes, let me know. 如果他来的话， 告诉我一声。// I shall give you my dictionary on condition that you return it tomorrow. 我将把我的字典给你， 如果你明天要还的话。 // I will go, providing/provided (that) my expenses are paid. 只要我的费用有人付， 我就去。 // Suppose/Supposing (that) he does not come, what shall we do? 他要是不来， 我们该怎么办？
3. as long as (=so long as) 表示充分必要条件， 引导语气强烈的条件状语从句时， 意为“只要”。例如： I will cooperate as long as I am notified on time. 只要及时告诉我， 我就会合作。 // You may use the book so long as you will return it on time. 只要你准时还， 你就可以借这本书。
［考题1］ Small sailboats can easily turn over in the water ____ they are not managed carefully. (2007上海)
A. though B. before C. until D. if
［答案］ D
［解析］ 根据全句意思， “they are not managed carefully”应表示一种假设， 因此下划线处应选用if引导条件状语从句。
［考题2］ In time of serious accidents, ____ we know some basic things about first aid, we can save lives. (2006重庆)
A. whether B. until C. if D. unless
［答案］ C
［解析］ 本题应选意为“如果”的if表示假设。
［考题3］ I would appreciate it ____ you call back this afternoon for the doctor’s appointment. (2003上海春)
A. until B. if C. when D. that
［答案］ B
［解析］ 本题应选意为“如果”的if表示假设。
［考题4］ It is known to all that ____ you exercise regularly, you won’t keep good health. (2005重庆)
A. unless B. whenever C. although D. if
［答案］ A
［解析］ 本题应选意为“如果不， 除非”的unless表示假设。
［考题5］ Most birds find it safe to sleep in the trees, but ____ they have eggs or young chicks, they don’t use a nest. (2007湖南)
A. why B. how C. unless D. where
［答案］ C
［解析］ 综合整句的意思， 下划线处应表示“除非……”含义的假设。
［考题6］ You will succeed in the end ____ you give up halfway. (2001上海春)
A. even if B. as though C. as long as D. unless
［答案］ D
［解析］ 本题应选意为“如果不， 除非”的unless表示假设。注意： even if表示“即使”， as though表示“好像”， as long as表示“只要”， 填入下划线都讲不通。
［考题7］ John may phone tonight. I don’t want to go out ____ he phones. (2000北京、 安徽春)
A. as long as B. in order that
C. in case D. so that
［答案］ C
［解析］ 本题应选in case表示假设。注意： in order that， so that都表示目的， 不符合题干的语境； 题干中表示推测的“John may phone tonight.”表明说话人对约翰打电话过来没有太大的把握性， 不适合采用语气强烈的as long as表示假设。
［考题8］ — I’m afraid Mr. Wood can’t see you until 4 o’clock.
— Oh, ____ I won’t wait. (2005浙江)
A. no doubt B. after all C. in that case D. in this way
［答案］ C
［解析］ 本题应选in that case表示假设。
［考题9］ ____ I know the money is safe, I shall not worry about it. (2003北京)
A. Even though B. Unless C. As long as D. While
［答案］ C
［解析］ 本题应选意为“只要”的as long as表示语气强烈的假设。 You did a good job. I need these . [quote]原帖由 [i]鸡仔贰号[/i] 于 2008-5-14 20:53 发表 [url=http://bbs.chxx.net/redirect.php?goto=findpost&pid=5678&ptid=1064][img]http://bbs.chxx.net/images/common/back.gif[/img][/url]
You did a good job. I need these . [/quote]
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