总复习-情态动词cancould.ppt

总复习,情态动词,情态动词（Modal Verbs）,情态动词本身有一定的意义但不完整， 因此不能在句子中独立作谓语， 只能和动词原形一起构成谓语， 即：情态动词 + 动词原形， 表示说话人对某一动作或状态的语气或态度。 情态动词通常没有人称和数的变化。,1. must “必须，应该”, 否定式 must not = mustnt “不许、不准” 2. have to “不得不，必须”, 有人称、数以及时态上的变化。 3. should “应该，应当”，表示劝告、建议。否定式 should not = shouldnt “不应该” 4. can 表示能力、许可或可能。 作为情态动词，有时态但无人称变化， 否定式是cannot = cant, 过去式是could, 过去式的否定式是could not = couldnt.,Can/ could,can 表示能力； could 用于一般过去时，表示过去的能力 -Can you swim? -Yes, I can. / No, I cant. When I was one years old, I couldnt walk. Now I can walk. can和could表示许可或请求许可， could语气更委婉客气，may比较正式。 -Can I borrow this book? -Im sorry you cant. -Could you help me with my English? No problem.,选择疑问句,说话者提出两个或两个以上的选项, 让对方选择回答。 其结构是： 一般疑问句或特殊疑问句加选择部分，选择部分用or。 朗读时，前面用升调，最后一个选项用降调。 回答时，须选择回答，不能用yes或no回答。 -Can you dance to disco or perform ballet? -I can perform ballet. -Which subject do you like best, English,Chinese or math? I like English best.,had better do sth.最好做某事 had better not do sth.最好不要做某事 =d better do sth.,( )1.Lucy, can you draw? _ But I can sing Chinese songs. A.No, I cant. B.Yes, I cant. C.Yes, I can. ( )2.Mom, can I have more chocolates? _ You cant eat too much. A.Thats OK! B.No way! C.Yes, you can. ( )3. _ Alice perform ballet two years ago? No, she _ . But now she _ . A.Can; cant; could B.Could; can; can C.Could; couldnt; could D.Could; couldnt; can ( )4.Can you play ping-pong _ basketball? I can play ping-pong. A.and B.or C.but D.with,( )5.I can play the guitar. _ can you do? I can also sing English songs. A.Something else B.What else C.What ( )6.Can Bill _ the party? Of course, he can. A.comes B.comes to C.come to ( )7.Could you ride a bike when you were 5 years old? _ A.Yes, I could. B.Yes, I couldnt. C.Yes, I can.,( )8.It is very cold outside. Youd better _ warm clothes. A.to wear B.wear C.wearing D.wears ( )9.Can you tell me the way to the bank? _ A.Yes, please. B. Sure. C.Dont ask me. ( )10.Can you speak Englis