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1、Adverbial clause of condition 状语从句状语从句 （Adverbial Clause）：）： 指句子用作指句子用作状语时，起副词作用的句子。状语时，起副词作用的句子。它可以修饰动它可以修饰动词，形容词，副词或整个句子词，形容词，副词或整个句子。根据其作用。根据其作用可分为时间、地点、原因、条件、目的、结可分为时间、地点、原因、条件、目的、结果、让步、方式和比较等从句。状语从句一果、让步、方式和比较等从句。状语从句一般由连词般由连词(从属连词从属连词)引导，也可以由词组引起引导，也可以由词组引起。从句位于句首或句中时通常用逗号与主句。从句位于句首或句中时通常用逗号与主
2、句隔开，位于句尾时可以不用逗号隔开。隔开，位于句尾时可以不用逗号隔开。常用的引导条件状语从句的从属连词有：常用的引导条件状语从句的从属连词有：if/provided that, unless (=ifnot), as/so long as, in case, on condition that, suppose/supposing, Adverbial Clauses of Condition I. if/provided that1)If you work harder, you will succeed.2)Provided that you work harder, you will s
3、ucceed. Work harder, and you will succeed.Work harder, or you wont succeed.II. Unless（if not）You wont succeed unless you work harder.=If you dont work hard, you wont succeed.*III. as long as(只要只要 ) 只要我还活着，我将不会放弃学习。只要我还活着，我将不会放弃学习。I will never give up learning as long as I am alive. *IV. on condition
4、 that（条件是）条件是）我们将会让你使用这个房间条件是是你我们将会让你使用这个房间条件是是你要打扫它要打扫它 Well let you use the room on condition that you clean it.*V. in case (万一）万一）你最好带上雨伞以防下雨。你最好带上雨伞以防下雨。Youd better take your raincoat with you in case it rains.种种类类从属从属连句连句例例 句句说说 明明条条件件状状语语 从从 句句if unlessas/so long asin case so far as Difficulti
5、es are nothing if we are not afraid of them. We shall go there tomorrow unless it rains.= We shall go there tomorrow if it doesnt rain. So/As long as you work hard, you will succeed. In case I forget it, please remind me about it . So far as I know, the book will be published next month.1. unless从句谓
6、语从句谓语只能用肯定式。只能用肯定式。2. unless和和ifnot同义，同义，unless是书是书面语，面语，ifnot是是口语，通常二者口语，通常二者可以换用。可以换用。3. 条件状语从句条件状语从句中的谓语动词的中的谓语动词的时态一般要用现时态一般要用现在时或过去时代在时或过去时代替一般将来时或替一般将来时或过去将来时。过去将来时。Summary问题问题1：1、The WTO cannot live up to its name _ it does not include a country that is home to one fifth of mankind. Aas long
7、as BwhileCif Deven though2、 It is known to all that _ you exercise regularly, you wont keep good health. A. unless B. whenever C. although D. if C CA A unless 相当于相当于 if not，意思是，意思是“除非除非”“如果不如果不就就”。这也是高考的热点之一。复习时也应给予高度。这也是高考的热点之一。复习时也应给予高度重视。重视。问题问题2：1、_ I can see, there is only one possible way to k
8、eep away from the danger. （04北京春季）北京春季） A. As long as B. As far as C. Just as D. Even if 2、I always take something to read when I go to the doctors _ I have to wait. （05全国卷全国卷3） Ain case Bso that Cin orderDas ifB BA A as long as 与与 as far as 都可引导条件状语从句，都可引导条件状语从句，as long as 表示表示“只要只要”，as far as 表示表示“就就而论而论（而言）（而言）”。题。题1根据题意应该选用根据题意应该选用B。in case 表示表示“以防以防”，根据题，根据题2的句意，不难作出选择。的句意，不难作出选择。