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1、自主探究 阅读下列句子，注意红体部分的意思及用法。 1.You must keep these points in mind while setting your goals. 2.There it cn pollute drinking water, harm plants, and eat away soil. 3.People tend to focus on the first factor. However, greater attention should be placed on longevity. 4.Check the top shell and you may find
2、what you want. 5.A simple twenty minute journey across town can become very interesting. 6.If you are time poor, you need run for only half the time to get the same benefits as other sports.,情态动词,探究发现 情态动词本身有词义，表示某种语气或感情,但词义不完整，不能单独作谓语，只能和动词原形一起构成谓语。情态动词没有人称和数字 的变化。 基础盘点 1. can、be able to和could的用法 (
3、1)当成功地完成某具体动作时，通常用was / were able to。这时was/were able to相当于managed to,表示经过一番努力,终于能够完成某事。 The wounded man was still able to get to the village and was saved in the end.这个伤员仍然坚持到达村庄,最终获救了。,(2)can和could比较 委婉客气地提出问题或陈述看法，一般用could,回答时则用can。 Could you help me carry the bag?请你帮我拿一下这个袋子好吗? Can I help you?有什么
4、可以为你效劳的吗? 2. must、mustnt和have to的用法 must表示在主观上“必须;应该”，没有时态变化，可以表示肯定的推测mustnt表示“禁止”have to表示“必须;不得不”，是由于某种外界(观)原因而“不得不”做某事, have to的否定形式示“不必”。 You must do everything as I do. 你必须照我订的做。 You will have to clean your own boots after you join the army. 参军后你就得自己洗皮靴。 The light is still on, so he must be at
5、home.灯亮着，所以他肯定在家。 You mustnt smoke in the office.你不能在办公室吸烟。,3. will和shall的用法比较 will 用于各种人称表示“意愿，决心；责任；必须；一定”等，在疑问句中，常与第二人称连用，表示说话人向对方提出“请求”或“询间,will还表示习惯性的动作,有“总是;习惯于”的含义。 在疑问句中，shall用于征求对方的意见或请求指示，常用于第一、三人称。 You will come, wont you? 你会来的，是不是? No one will leave the examination room before ten oclock
6、. 十点以前谁也不能离开考场。 Where shall he wait for us?他将在哪里等我们? Shall we go out for a walk?我们去散步好吗?,4. would和used to的用法 would表示客气的请求、建议或意愿，或过去反复发生的动作。 used to表示过去常发生的动作或存在的习惯，但现在已不存在。 Would you please be quiet?请你安静点好吗? When I passed my shool, I would see my teachers who taught me 5 years ago. 当我经过我的学校时，我总是会去看看
7、5年前教我的老师。 There used to be a park here.这儿口南有个公园。 need和dare的用法 need既可作情态动词，也可作实义动词，作实义动词时后面的动词不定式要带to,其变化与一般动词相同。 dare作情态动词时，主要用在疑问句和否定句中。若作实义动词，有时态和人称的变化，后面可接带to的不定式，to可以省略。,变式训练 1.用can ,could.may (might).must或have (had)to 填空 (1)He swim and skate well when he was only four years old. (2)- we clean t
8、he classrom before going home? -No,you neednt (3)She told me that she come. (4) - I come in? -No,you mustnt, (5) The foreigner is speaking slowly and clearly so that he make himself understood. (6)She said that we pay attention to our behaviours. (7) what he said be true? (8) Yesterday it rained hea
9、vily,so we the sports meeting. (9) What I do for you?,could,Must,might,May,can,must,Can,had to,can,II. 完成句子. (1)He sometimes （会粗心）when taking an exam. (2)Since it is raining, we （不得不待在家里). (3)I （过去常常）drink black tea,but now I drink green tea. (4) (他有可能) in the classroom now? (5) （他可以）come in?,can be
10、 careless,have to stay at home,used to,Can he be,Shall he,自主探究 1. He asked me yesterday when I should leave for Paris. 2. They wanted to know how they would finish the homework earlier. 3.I wish I would go with him to the cinema tonight. 4.1 was told that he was going to return home. 5. He said that
11、 he would wait for me at the school gate. 探究发现 过去将来时是由“ ”或“ ”构成的。 过去将来时表示从过去某一时间来看将要发生的某个动作或存在的某种状态，但这个“将来”时间地不会延伸到“现在“，而仅限于“过去时间区域内”.,过去将来时,should/would+动词原形,was/were going to+动词原形,基础盘点 一、过去将来时的用法 过去将来时表示从过去某个时间看将要发生的动作或存在的状态，常用于宾语从句或间接引语中，过去将来时常用“should/ would+动词原形”或“was/were going to+动词原形来表达。 Whe
12、never we had trouble, he would come to helpus. 每当我们遇到困难时，他总会给予帮助。 I didnt know when she would come, but when she came I would let you know.我不知道她什么时候来，但她来了我会告诉你。 The teacher said that it would be very difficult to make progress if I didnt work hard. 老师说，如果我不努力学习的话，就很难取得进步。 We were going to go to the
13、cinena when the phonerang. 我们正准备去电影院，这时电话响了。,(1)条件状语从何和时间状语从句中须用一般过去时代替过去将来时。 (2)was/were going to do表示在过去某一时间准备，计划做某事，或将要发生某事。 (3)表示过去的某种习惯性行为,只用would. 二、过去将来时的其他结构 1. was/were about to do表示“正要/即将做某事”;was/were on the point of doing 表示“正.”. 2. go/come /leave/ take off等少数动词可用过去进行时表示过去将要发生的情况:was/vere
14、to do表示曾计划做某事。 3.was/were supposed to do和was/were meant to do可以表示过去计划做但没有做的事。,I couldnt go to Toms birthday party as I was about to go to hospital. 我不能参加汤姆的生日晚会,因为我要去医院。 He was on the point of leaving when we came in.我们进来时，他正要动身。 A lot of peoplewere coming to watch the fireworks.有许多人要来观看焰火。 She told
15、 her mother that she was going to a dancewith Tom. 她告诉母亲，她要和汤姆起去参加一个舞会。 She said she was to take up the position.她说她要接任这个职务。 The train was supposed to arrive half an hour ago. 火车本应在半小时之前到达。,变式训练 完成句子 (1)Li Ming said he if Brian came to China. 李明说如果Breain来中国他会很高兴。 (2) She hoped that they again someda
16、y. 她希望将来有一天他们能再见面。 (3)She didnt tell me . 她没有告诉我她要去哪儿。 (4) Last Sunday we but it rained. 上星期天我们要去游览长城,但下雨了。 (5)He said the train the next morning. 他说火车将于第二天早晨六点离开。,would be happy,would meet,where she would go,were going to,was leaving at six,完成句子 1. You at the red light.遇到红灯时你必须停下来。 2. I suggest that he to Beijing to pursue his studies. 我建议他来北京求学。 3. We the law. 我们都必须遵守法律。 4. You more fresh fruit. 你应该多吃新鲜水果。 5. Students the teacher says. 学生应当按照老师说的去做。 6. Whenever he had time, he his mother with
