if引导的条件状语从句
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◆ if引导的条件状语从句 条件状语从句是在复合句中作条件状语的句子。表示假如有从句的动作发生就会有主句的动作发生。条件状语从句常由从属连词if引导。 ◆if引导的条件状语从句使用须知: 一、位置 if引导的条件状语从句,既可放在主句之前也可放在主句之后。当从句置于主句之前时,常用逗号与主句隔开。例如: You will catch the bus if you get up early. =If you get up early, you will catch the bus. 如果你早起的话,就能赶上公共汽车。 二、时态 应遵循主、从句时态呼应的原则。当主句是一般现在时 (包含祈使句和含情态动词can, may, must等的句子),从句也用一般现在时。例如: You must see the doctor if you are ill. 如果你生病了,你必须去看医生。 If you want to go skating, wear warm clothes. 如果你想去滑冰,穿上暖和点的衣服。 如果主句是一般将来时,从句必须用一般现在时。例如: You will be late for school if you get up late. 如果你起晚了,你上学将迟到。 If it rains tomorrow, we won’t go to the Great Wall. 如果明天下雨,我们就不去长城了。 三、注意事项 1. 在if引导的条件状语从句中,当主句是一般将来时时,不能够使用be going to结构,而要用will。例如: I’ll help you with your English if I am free tomorrow. 如果明天我有空,我会帮你学英语。 2. 在if引导的条件状语从句中不能够使用some,而要用any。例如: If you have any questions to ask, please come to my office. 如果你有问题要问的话,请到我办公室来。 四、同义句转换 if引导的条件状语从句可以转换成简单句,其方法如下: 1. 借助“祈使句+and/ or+简单句”。其中and表示句意顺承,or表示转折。例如: If you work hard, you’ll pass the exam. =Work hard, and you’ll pass the exam. 如果你努力学习,你就会通过考试。 If you don’t hurry up, you’ll be late. = Hurry up, or you’ll be late. 如果你不快点,你将会迟到。 2. 借助介词with 或without来转换。例如: If you help me, I’ll finish my job soon. =With your help, I’ll finish my job soon. 如果你帮我,我将很快完成我的工作。 1 / 31 / 31 / 3 If there is no water, fish may die. = Fish may die without water. 如果没有水,鱼可能会死。 【巩固练习】 一、用所给动词的适当形式填空。 1.If I run every day, I ______(be) healthier. 2.If you _____(not eat) healthily, your body won’t be well. 3.If you sleep well, you _____(feel) better. 4.If you _____(relax), you’ll sleep better. 5.Do more exercise, and it will make your mind and body _____(work) better. 二、完成句子(一空一词)。 1.如果你要过马路,不要乱跑。 _____ _____ around if you cross the road. 2.明天如果下雨的话,我们将呆在家里。 We _____ _____ at home if it _____ tomorrow. 3. 如果你能说好英语的话,你就可以容易地与外国人交谈。 If you can _____ English well, you _____ ______ ______ foreigners easily. 4.如果你对别人好,人们也会对你好。 If you’re nice to people, they _____ _____ _____ to you, too. 5.如果学生不对考试如此担心的话,他们会更开心的。 If students don’t worry about exams so much, they _____ ______ ______. 三、同义句转换。 1. Study hard, or you won’t pass the exam. If you study hard, you _____ _____ the exam. 2. Take a taxi, and you’ll catch the train. _____ you _____ a taxi, you’ll catch the train. 3. If you go to bed early, you won’t feel tired in the morning. _____ _____ _____ early, _____ you won’t feel tired in the morning. 4. If you don’t work hard, your teacher will probably be angry. ______ _____, _____ your teacher will probably be angry. 5. Breathe deeply for one minute, and you’ll feel relaxed. _____ you ______ deeply for one minute, you _____ _____ relaxed. 四、阅读下面的广告,然后用“if..., ...will...”句式回答问题。 Travel Brochure Cheap Cheap Cheap. Beijing for the weekend. 3D/2N. Book Now. Five Star Hotel—Save 50% Four Star Hotel—Save 40% Three Star Hotel—Save 30% Book before December 31st. Breakfast Included. City Tour 50RMB. Visit the Great Wall 100 RMB. 1. How much will you save if you stay at the Four Star Hotel? ___________________________________ 2. How much will you save if you stay at the Three Star Hotel? 2 / 32 / 32 / 3 本文来源:https://www.wddqw.com/doc/c47884096d1aff00bed5b9f3f90f76c660374c6c.html