if引导的条件状语从句知识点及练习题.docx

细心整理if引导的条件状语从句〔一〕定义 if引导的句子在复合句中表示条件，假设if从句的动作发生，主句的动作就〔不〕会 发生，因此称为条件状语从句〔二〕位置 if 引导的条件状语从句位置灵敏，可干脆放在主句后面，也可以放在句首放在句首 时，从句后面要用逗号和主句隔开 ① If I have enough money, I will travel around the world. ② I will travel around the world if I have enough money.〔三〕用法〔1〕当主句是一般将来时时，从句用一般此时此刻时〔主将从现〕构成条件从句主句时态If+一般此时此刻时主句+shall/will+动词原形例句 If it rains tomorrow, we’ll stay at home〔2〕当主句是祈使句时，从句也用一般此时此刻时 ① Work hard, and you’ll pass the exam easily. 努力学习，你将很简洁通过考试 →If you work hard, you’ll pass the exam easily. ② Hurry up, or you’ll miss the train. 快点儿，否那么你就赶不上火车了。

→If you don’t hurry up, you’ll miss the train. 〔3〕当主句含有情态动词时，if引导的条件状语从句通常用一般此时此刻时 We must study hard if we want to pass the final exam. 假设想通过期末考试，我们必需努力学习〔4〕用含介词with或without的介词短语转换 ① If you help me, I'll finish my job soon. →With your help, I'll finish my job soon. 假设你帮我，我将很快完成我的工作 ② If there is no water, fish can’t live. → Fish can’t live without water. 离开水，鱼不能生存 〔四〕if引导的条件状语从句与if引导的宾语从句的区分 if引导宾语从句时表示“是否”，位于及物动词之后； if引导的条件状语从句时表示“假设，假设”，位于句首或句中。

① I don't know if he will come tomorrow. ② If he comes, I'll call you.练习一、选择题1. _____ you don't go to bed earlier, you will feel tired in the morning. A. Unless B. If C. Though D. Until2. Why not look up the new word in a dictionary _____ you don't know it? A. if B. that C. though D. whether3. Talk to your teacher and you will get help _____ you have a problem. A. unless B. if. C. until D. so4. I won't go to tomorrow's party _____ I'm invited. A. if B. unless C. when5. The children will climb the hill if it _____ tomorrow. A. won't rain B.didn't rain C. isn't raining D. doesn't rain6. We wonder if our teachers _____ to our graduating party next weekend. If they_____, we'll be very happy. A. will come; will come B. come; will come C. will come; come D. come; come二、翻译句子。

1. 假设明天下雨，我们将在家看电视 We'll stay at home watching TV if it _____ 〔rain〕tomorrow.2. 假设她早点起床，就有时间在家里吃早餐. If she ______ _______ a little earlier, she ‘ll have time to eat breakfast at home. 3. 假设你参加聚会，你将会过得很欢乐 If you ______ the party, you ______ ______ a great time.4. 假设你常常听英文歌，你将会宠爱英语 If you often ______ ______ English songs, you ______ _______ English.一、BABBDC二、1. rains 2. gets up 3. join, will have 4. listen to, will like。