外研版八年級上Module12Unit3

1、Module 12HelpObjectivesTo summarise and consolidate the use of modal verbs must, can, could (for prediction)To learn the imperative for suggestions and instructionsI dont know when theyll be here. They could arrive at any time.我不知道他們多會來，他們可能隨時會來。我不知道他們多會來，他們可能隨時會來。This new drug could be an important

2、 step in the fight against cancer.這種新藥可能是攻克癌癥過程中邁出的重要一步。這種新藥可能是攻克癌癥過程中邁出的重要一步。The phone is ringing. It could be Nick.Read the sentences and conversations and pay attention to the circled parts. What do they mean? Who sent the present? Can it be your brother? It must be your brother. I saw him in you

3、r room just now. It cant be my brother. He is still in France.1. That could be harmful!2. Betty, you must know!3. But he could have trouble hearing you or speaking to you.4. You could drop him and hurt him even more. Observe the following sentences carefully and pay attention to the words in red.情態(tài)動

4、詞must, can,could表推測注意：注意：用于疑問句時，用于疑問句時，can比比could 表表示的示的“可能性可能性”要大要大。情態(tài)動詞情態(tài)動詞 must/can/could 表示推測表示推測 之前我們學(xué)過情態(tài)動詞之前我們學(xué)過情態(tài)動詞 can和和could 表表“能夠，可以能夠，可以”等意義的用法。等意義的用法。 另外，另外，can和和could 還可還可表示表示對現(xiàn)在或?qū)ΜF(xiàn)在或?qū)淼耐茰y來的推測，意為，意為 “會會, 可能可能”。 1. He could be in pain. 他他可能可能很疼。很疼。 2. That could be harmful! 那那可能可能有害！有害！

5、 3. Can/Could this be true? 這有這有可能可能是真的嗎是真的嗎? 情態(tài)動詞情態(tài)動詞 must 表示表示有把握的猜測有把握的猜測，意為意為“一定，準(zhǔn)是一定，準(zhǔn)是”，通常只用于通常只用于肯定句肯定句。如：。如： Betty, you must know! 貝蒂，你肯定知道！貝蒂，你肯定知道！ 請仔細(xì)對比下列一組句子：請仔細(xì)對比下列一組句子： Who sent the present? Can it be your brother? 是誰送來的禮物啊？是誰送來的禮物啊？會會是你哥哥是你哥哥嗎嗎？（詢問可能性詢問可能性） It must be your brother. I

6、saw him in your room just now. 肯定肯定是你哥哥，我剛才看見他在你的房間里。是你哥哥，我剛才看見他在你的房間里。 （語氣強(qiáng)烈，表示非常肯定語氣強(qiáng)烈，表示非常肯定） It cant be my brother. He is still in France. 不可能不可能是我哥哥，他還在法國呢。是我哥哥，他還在法國呢。（表示不可能表示不可能）1. Hide under a table. Stay away from windows and heavy furniture. Keep Clear of fires. 2. Leave the buildings quic

7、kly 3. Keep calm, Be brave and be helpful.4. Move away from buildings, 5. Stay away from bridges and trees. 6. In the mountains, be careful of falling rocks.7. On a beach, run away from the sea and move quickly to higher ground.What shall we do or not do if an earthquake happens?1. Dont jump out of

8、high buildings. 2. Dont stand near street lights or under power lines.1. Stay away from windows and heavy furniture.2. Do not stand near street lights or under power lines.3. Make sure hes warm. Cover him with a coat.4. Find out whats wrong with him.5. Do not jump out of high buildings.6. On a beach

9、, run away from the sea and move quickly to higher ground. Observe the following sentences carefully and pay attention to the words in red.1. _ _ _ (stay) windows and heavy furniture.2. _ _ (stand) near street lights or under power lines.3. _ _ (make sure) hes warm. _ him with a coat.4. _ _ (find) w

10、hats wrong with him.5. _ _ _ _ _ (not jump) high buildings.6. On a beach, _ _ _ (run) the sea and _ (move) quickly to higher ground.Make sureFind outDo not jump out of run away from moveCover Stay away from Dont standgo Ready?祈使句祈使句 祈使句祈使句表達(dá)表達(dá)說話人對對方的叮囑、勸告、說話人對對方的叮囑、勸告、希望、禁止、建議、請求或命令希望、禁止、建議、請求或命令等。等

11、。 * *一般一般以動詞原形開頭以動詞原形開頭，無時態(tài)和數(shù)的變化無時態(tài)和數(shù)的變化。 * *常見的祈使句如下：常見的祈使句如下： 1. 動詞原形構(gòu)成的祈使句動詞原形構(gòu)成的祈使句 2. lets構(gòu)成的祈使句構(gòu)成的祈使句 3. 無動詞祈使句無動詞祈使句1. 動詞原形或動詞原形或BeBe單詞構(gòu)成的祈使句單詞構(gòu)成的祈使句 此類祈使句暗含的主語是此類祈使句暗含的主語是you，但通常省略。，但通常省略。 否定句否定句往往往往由由 do not (dont)或或never開頭開頭。Have a nice day! 祝你度過美好的一天！祝你度過美好的一天！Dont waste your time! 別浪費(fèi)時間了

12、！別浪費(fèi)時間了！Never be late again! 再也不要遲到了！再也不要遲到了！Come this way, please. 請走這邊。請走這邊。Please be quiet, boys! 男孩們，請安靜！男孩們，請安靜！ 祈使句的祈使句的句首或句末句首或句末有時加有時加 please，還可以還可以加上稱呼語加上稱呼語，用逗號與句子主，用逗號與句子主體隔開。體隔開。2. lets構(gòu)成的祈使句構(gòu)成的祈使句 這類祈使句往往用于這類祈使句往往用于提出建議提出建議。 Lets spend this weekend in the countryside. 這周咱們到鄉(xiāng)下度周末吧。這周咱們到鄉(xiāng)

13、下度周末吧。 Lets take a taxi, shall we? 我們坐出租車好嗎？我們坐出租車好嗎？lets/let us否定形式： 1.let us 前可加dont，也可以let us not Dont let us go with her tomorrow =Let us not go with her tomorrow. 2.Lets,必須在其后加not Lets not go with her tomorrow.3. 無動詞祈使句無動詞祈使句 在在請求請求、命令命令和和口號口號中，常用無動詞中，常用無動詞祈使句，它實際上是祈使句，它實際上是省略了動詞省略了動詞，從，從而而使語句更

14、簡潔有力使語句更簡潔有力。 Just a minute, please! 請稍等！請稍等！ This way, please! 請這邊走！請這邊走！ 4. 在公共場合的提示語中，否定句常用：在公共場合的提示語中，否定句常用：NO+名詞或動名詞名詞或動名詞結(jié)構(gòu)結(jié)構(gòu) NO photos ! NO smoking!can和和could可以表示可以表示對現(xiàn)在或?qū)淼耐茰y對現(xiàn)在或?qū)淼耐茰y?！癿ust be + 表語表語”表示對現(xiàn)在情況的推測，表示對現(xiàn)在情況的推測，常用于肯定句，意為常用于肯定句，意為“一定，準(zhǔn)是一定，準(zhǔn)是”。常見的祈使句如下：常見的祈使句如下： 1. 動詞原形構(gòu)成的祈使句動詞原形構(gòu)成的

15、祈使句 2. lets構(gòu)成的祈使句構(gòu)成的祈使句 3. 無動詞祈使句無動詞祈使句注注: word : word 文檔文檔點(diǎn)擊此處鏈接點(diǎn)擊此處鏈接Quiz I. 用用could/can/must或他們的適當(dāng)形式填空?；蛩麄兊倪m當(dāng)形式填空。 Is that woman your head teacher? No, it _ be her. Our head teacher is in her office.2. Whose schoolbag is this? It _ be Jennys. It has her name on it.3. Listen! Someone is knocking a

16、t the door. Who _ it be?cant couldmustII. 按要求完成句子。按要求完成句子。1. You must be careful with your handwriting. (改為祈使句改為祈使句) _ _ with your handwriting.2. Talk and read loudly in class. (改為否定句改為否定句) _ _ and read loudly in class.3. The girl singing in the next room must be Lucy. (改為否定句改為否定句) The girl singing

17、in the next room _ _ Lucy.Be carefulDont talk cant beIII. 根據(jù)提示，用祈使句型寫出句子。根據(jù)提示，用祈使句型寫出句子。1. 請舉起你的右手。請舉起你的右手。 2. 不要在課堂上大聲說話。不要在課堂上大聲說話。 3. 咱們一起上學(xué)去吧。咱們一起上學(xué)去吧。 4. 請來兩塊面包。請來兩塊面包。 5. 再不要這樣做了。再不要這樣做了。Never do that again.Please put up your right hand. Dont talk loudly in class. Lets go to school together. T

18、wo pieces of bread, please. IV. 根據(jù)語境選用根據(jù)語境選用could, must或或cant填空。填空。1. Theres a bag on the desk. Whose _ it be?2. I think the book _ be Mikes because his name is on it.3. Is that your sister? It _ be her. She went to Shenyang this morning. could cant must V. 根據(jù)括號內(nèi)所給英文提示語將下列句子根據(jù)括號內(nèi)所給英文提示語將下列句子翻譯成英語。翻譯成英語。1. 晚上不要獨(dú)自外出。晚上不要獨(dú)自外出。 (dont) Dont go out alone at night. 2. 在課堂上請聽老師的。在課堂上請聽老師的。 (listen to) Listen to the teacher in class, please. / Please listen to the teache