外研版九年级英语下册《Language in use》Rules and suggestions PPT教学课件，共38页。Learning Goals通过本课的学习，学生能够：①复习巩固情态动词的用法②了解生态旅游③能给来中国旅游的游客写一些建议Warming UpImagine you are in a museum. Say what they mean when you see the following signs.No touching!You mustn’t touch the things on display.No photos!You mustn’t take photos here.Staff only!You mustn’t enter the room if you are not the staff of the museum.No loud talking!You mustn’t talk with others loudly here.情态动词（Modal verbs）情态动词表示说话人对动作的观点，如需要、可能、意愿或怀疑等，不能单独作谓语，情态动词与助动词一样，后面需要接动词原形构成谓语，它们一般没有人称和数的变化(have to除外)。常见的情态动词有can, could, may, might, must, have to, should, shall, would, will, need(1) can/ could① 表“能力”（此时could是can的过去式）I can speak English well now but I could’t 10 years ago.我现在说英语很好但是十年前我不行。②表“许可”，可表示请求他人许可或许可他人（could 表示委婉语气）—Could I use your bike? —Yes, you can.③表“推测”We thought the story could not be true.It can’t be Mr. Li.(2) may/ might①表“许可”，可表示请求他人许可或许可他人（might 表示委婉语气）You may sit here if you want.Might I smoke here? ②表“推测”，可能性推测（might 表示委婉语气）She may not like this place.她可能不喜欢这个地方。(3) must/ have to①must表示义务，意为“必须”。在回答must引导的一般疑问句时，肯定回答用must，否定回答用needn’t或don’t have to。mustn’t 表示禁止。—Must I finish my homework today？我必须今天完成作业吗？—Yes, you must. 是的，你必须。(No, you needn’t./No, you don’t have to.不，你不必。)②表“推测”，肯定推测The book must be Lily’s because there’s her name on the cover.这本书一定是莉莉的，因为封面上有她的名字。(3) shall/ should①shall用于第一、第三人称，表示征求意见或请求指示用于第二、第三人称表示“命令”“警告”“强制”“允诺”“决心”—Shall I let him in?(征求意见，请求指示)—Yes, you shall.（允诺）②should表示“应该”，常用来表示劝告、建议, 认为“某人应该做某事”或“有义务责任做某事”。We should take care of the old.我们应该照顾好老人。Possible answersYou must check in at the main gate when you come to the centre.You should climb with someone.You must wear a hard hat all times.You must wear the correct climbing shoes.You must wear comfortable clothes.EcotourismEcotourism is also known as “responsible tourism”. It means you visit places without damaging the environment.Many countries around the world have started ecotourism holidays and trips. Tourists help the local communities look after their natural environment. Here are some rules of ecotourism.Summary1. Grammar:情态动词（can/could, may/might, must/have to, shall/should）2. Topic:Write some advice for visitors to Chinalearn about ecotourism... ... ...关键词：Language in use PPT课件免费下载，Rules and suggestions PPT下载，.PPTX格式； 本作品中主体文字及图片可替换修改，文字修改可直接点击文本框进行编辑，图片更改可选中图片后单击鼠标右键选择更换图片，也可根据自身需求增加和删除作品中的内容，源文件无水印。如认为该内容涉嫌侵权，可通过邮件提出书面通知，我们将及时处理。