强烈推荐广州英语七年级下册unit6.ppt

could 肯定 （1）can的过去式，意为“能、会”，表示过去的能力。 如：He could write poems when he was 10. 他十岁时就会写诗。 否定 couldnt (2) could在疑问句中，表示委婉的语气，此时could没有过去式的意思。 如:Could you help me？ 你能帮我个忙吗？ I can play basketball well. Can you? No, I can’t. But I can swim fast. I can sing beautiful songs. Can you? No, I can’t. But I can play konfu. Can you? 1.Hi ______ play football. 2.Lo ________ paint pictures. 3.Hi _____ speak as many languages as Lo. 4.Both Hi and Lo______ dance. 5.Lo _____ drive a car, but he _____play chess. 6.Hi ____ swim, but he _______ play the guitar. can cant cant can cant can can cant Yes, you may/can. May/Can I sit down? ___________I come in? Yes,you may/can. No, you may not /cant. May/Can B may and may not We use may and may not to ask for and Give permission(许可）. We also use can and cannot (can’t) for the same purpose. May/Can I use you mobile phone? Yes, you may/can. No,you may not/cant. may/ might 允许；请求与 can 同义，可以互换 May I have a glass of water? May you borrow me your pen? 可能；也许 (may比might语气强） They may be in the library now. He might be at home. 表示祝愿 May you always be young.祝你永远年轻。 May you have a good time.祝你过得愉快。 May you be happy!祝你幸福！ May you succeed！祝你成功！ 注意：might为may的过去式外， might还有表示语气婉转之义。 Might I have a look? 比May I have a look?更有礼貌。但答语还用Yes, you may. No, you may not. C must and must not We use must and must not (mustn’t) to tell people what to do or what not to do. You must not/mustnt do that Benny! We must always be careful with electricity. They must not/mustnt play near the heater. must 必须；表示命令 We must work harder. must not意为禁止；不许； We must not be afraid of difficulties. You mustn’t smoke here. must 还可以表示非常肯定的猜测，意为 “一定” 如：The girl in a red skirt must be Lucy. 注意：must的提问肯定回答用must, 否定用 needn’t或者don’t have to.表示“不必”，不用mustn’t ---Must I return the book? ---Yes, you must. ---No, you needn’t./ don’t have to. 注意：must/ have to 的区别： ①. must表示必须，强调主观上的愿望； have to表示“不得不”，强调客观需要 如：You must go be bed before 22:00pm. My bike is broken, so I