Unit6 Grammar 同步学案2024-2025学年沪教版(2024) 七年级英语上册

沪教版2024 七年级上册 Unit 6　Travelling around Asia 第二课时　Grammar 单元语法精讲 if 条件状语从句的用法 　　条件状语从句通常由连词if引导，意为“如果；假如”，表示在某种条件下，很可能会发生某种事情。 1. if 条件状语从句的位置 在if引导的条件状语从句中，if条件句位置灵活，可直接放在主句后面；若if条件句放在句首，从句后面要加逗号和主句隔开。如： If I have time tomorrow, I’ll go to the countryside. 从句 　　　　　　　　主句 ＝I’ll go to the countryside if I have time tomorrow. 主句 　　　 　从句 2. if 条件状语从句的时态搭配 (1)主句的谓语用一般将来时，从句的谓语用一般现在时(即：主将从现)。 · I will let you know if he comes back. 如果他回来，我会让你知道的。 · We will go if the weather stays fine. 如果天气一直好，我们就去。 (2)主句的谓语动词含有情态动词时，if从句用一般现在时(即：主情从现)。 · If you visit People’s Square, you can also see famous buildings around it. 如果你去参观人民广场，你还能在它周围看到很多著名的建筑。 You must start now if you don’t want to be late. 如果你不想迟到，你必须现在出发。 (3)主句是祈使句时，if从句用一般现在时(即：主祈从现)。 · Work hard if you want to get a good mark！ 如果你想取得好成绩，努力学习吧！ · If you want to listen to music, buy a CD！ 如果你想听音乐，买张CD吧！ 3. if引导的条件状语从句与if引导的宾语从句的区别 if引导的条件状语从句中if意为“如果”，主句用一般将来时，从句则用一般现在时；if引导宾语从句时，if意为“是否”，相当于whether，时态需根据语境确定。 · I don’t know if it will rain tomorrow. 我不知道明天是否会下雨。 if 条件状语从句用法歌诀：if条件句不一般，几个要点记心间；条件句，放在前，逗号要放句中间。条件句，表可能，主句多用将来时；条件句，表事实，主句常用现在时。 4. if 条件状语从句与其他句式的转换 (1)借助“祈使句＋and/or＋陈述句”来转换。 · If you get up early, you’ll get there on time. ＝Get up early, and you’ll get there on time. ＝Get up early, or you won’t get there on time.早点起床, 你就会准时到那里。 注意：and 在句意上表示顺承关系； or 表示转折关系。 (2)借助介词 without 或 with 来转换。 · If there is no water, fish will die. ＝ Fish will die without water. 如果没有水，鱼就会死。 · If you help me, I can finish the work soon. ＝ With your help, I can finish the work soon. 如果你帮助我，我能够快点完成工作。 基础练习·课时过关 一、 用括号内所给单词的适当形式填空。 1. If he ___________(eat) less meat, he ___________(be) healthier. 2. We ___________(go) shopping if it ___________(stop) raining. 3. He ___________(come) if you ___________(invite) him. 4. If there ___________(be) snow, the children ___________(go) out and make snowmen. 5. If you ___________(go) to bed early, you ___________(not feel) tired in the morning. 6. If you ___________(ask) him, he ___________(tell) you. 7. I ___________(visit) the Great Wall if it ___________(not rain) next Sunday. 8. If you ___________(use) your head, you ___________(find)a way. 9. Tomorrow is Ann’s birthday. If you ___________(buy)her a book, she ___________(be) very happy. 10. If you ___________(read) it aloud, the class___________(hear) you. 二、 单项选择。 ( ) 1. Mary will go to Sanya if she ________ a five-day trip. A. have B. had C. will have D. has ( ) 2. What will you do if you _______ to the party without invitation？ A. go B. went C. going D. will go ( ) 3. I’ll give the book to him if he  ________ here next Sunday. A. will come B. comes C. is coming D. came ( ) 4. --- I can stay and help you _________ you like. --- So nice of you, Bill. A. until B. if C. though D. and ( ) 5. --- Would you like to go for a walk with me, Allen？ --- I’d love to, _________ you don’t want to go alone. A. until B. before C. if D. after ( ) 6. If you don’t know the word, you can __________ in a dictionary. A. look it up B. look up it C. look it out D. look out it ( ) 7. You will _______ what kind person he is some day if you know about him. A. find B. find out C. look D. look for 三、 根据汉语意思完成句子，每空一词。 1. 如果他看电视太久，他的父母会不高兴。 If he __________ TV for too long, his parents __________ __________unhappy. 2. 如果明天不下雨，我和你一起去公园。 If it __________ __________ tomorrow, I __________ __________to the park with you. 3. 如果他有空，他会帮你的。 If he __________ __________, he __________ __________you. 4. 如果他不来，会发生什么事？ What __________ __________ if he __________ __________? 5. 如果你乘坐出租车，你就能赶上火车。 If you __________a taxi, you can __________ the train. 参考答案 基础练习·课时过关 一 1. eats, will be 2. will go, stops 3. will come, invite 4. is, will go 5. go, won’t feel 6. ask, will tell 7. will visit, doesn’t rain 8. use, will find 9. buy, will be 10. read, will hear 二 1-5 DABBC 6-7 AB 三 1. watches, will be 2. doesn’t rain 3. doesn’t rain, will go 4. is free, will help 4. will happen, doesn’t come 5. take, catch 学科网（北京）股份有限公司 $$