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课件网) Module 5 Museums Unit 3 Language in use. 学习目标 1.能按类别整理单词或词组，提高单词学习效率。 2.能够听懂和正确运用if状语从句和祈使句。 3.能够运用所学的知识，谈论自己喜欢的博物馆及其他地方 新课导入 1 Match the signs with the rules. If I start after dinner, I’ll finish it before I go to bed. If you do all these other things instead of your homework, you won’t have time to study. He thinks something will go wrong if I play games on it. Look at these sentences, which sentences have a comma(逗号) in the middle and which doesn’t When “if” is in the middle of the sentence, there is no comma. 新课讲授 Language practice 条件状语从句 主句 从句 引导词 If I start after dinner, I’ll finish it before I go to bed. 翻译：如果我在晚饭后开始，我将在我睡觉前完成它。 主句 从句 引导词 翻译：如果你老是做与学习无关的事情，那么你就没有时间学习。 If you do all these other things instead of your homework, you won’t have time to study. 新课讲授 (3) 在表达请求时，可以加上please; 表达比较强烈的语气时，可以用感叹号。 e.g. Please don’t be late again. 请不要再迟到了。 (4) Let’s 构成的祈使句往往用于提出建议。否定形式为：Let + 宾语 + not + 动词原形 + 其它成分。 e.g. Let him not make any noise. 让他别发出声音。 新课讲授 (5) 在请求、命令和口号中，常用无动词祈使句，它实际上是省略了动词，从而使句子更简洁有力。 e.g. Quiet, please! 请安静！ This way, please. 请这边走。 新课讲解 3 Complete the sentences with the correct form of the words in brackets. If you _____ (want) to see old machines, _____ (go) to the museum. 2. If you _____ (visit) London, _____ (take) a boat trip on the river. 3. If the computer does not _____ (start) immediately, _____ (wait) for one minute. want go visit take start wait 新课讲解 4. If the weather _____ (get) colder, _____ (put) on more warm clothes. 5. If any student _____ (have) a high fever, _____ (send) him / her to the school doctor at once. 6. If you _____ (want) to know how it works, _____(read) the book. gets put has send want read ( )4．(2022·毕节中考)Students _____ play with fire in the classroom．It's quite dangerous. A．mustn't B．must C．couldn't D．could 【解析】mustn't禁止；must必须；couldn't不能；could可以。根据句意和常识可知，应是学生在教室里禁止玩火。故选A。 A ( )5．—Peter, _____ football on the street！It's dangerous. —OK, Mum. A．not play B．no play C．don't play D．play 【解析】根据语境及句意可知，彼得的妈妈不让他在马路上踢足球。此处用“don't＋动词原形”表示“禁止，不能”。故选C。 C 3.时态： 在以if 引导的条件状语从句中， 如果主句为祈使句， 从句通常用一般现在时。 e.g. Put up your hand if you have any questions to ask. 如果你有问题要问, 请举手。 在if引导的条件状语从句中，符合以下原则： 原则1：主将从现 主句是一般将来时，从句用一般现在时。 e.g. If my brother comes back, he will take me to the park. 如果我哥哥回来了，他会带我去公园。 原则2：主情从现 主句含有情态动词can/may/might/must/should等，从句用一般现在时。 e.g. If you want to be healthy, you should keep a ... ...
