U5 Discovering useful stuctures同步课件-2022-2023高中英语同步备课堂（人教版2019）（必修第三册）

Models for Guessing 表推测的情态动词 must 为肯定发生 can’t/couldn’t 为不可能发生；couldn’t否定意味没有can’t 强烈 will/would/can/could/may/might 为可能发生，语气依次减弱 will/would/can/could/may/might not 为可能不会发生，语气依次减弱 mustn’t 不表推测，意为“禁止” 情态动词可以表示对将来、现在或过去情况的推测，推测结果有三种 肯定发生；可能发生；不可能发生。 对现在、将来的动作推测 情态动词+be；情态动词+do； 对正在发生的动作推测 情态动词+be doing”。 对过去情况的推测，情态动词+ have done” He must work very hard= I’m sure he generally works very hardThere must be another way of doing it. 一定有别的方法做这件事。Going by her clothes, she must be very rich. 从她的衣着来判断，她一定很有钱。She must arrive before 5 5:00前她一定到.They must be working. 他们一定正在工作。 must do must be must be doing对现在或将来情况作推测，意思是“一定” They can’t be rich= = I don’t think they are rich.That can’t be Mary — she’s in hospital. 那个人不可能是玛丽——她住院了。The moon can not always be at the full. 月不可能常圆。You’ll see it on your left. You can’t miss it. 它在你的左手边。你一定不会错过You couldn’t be hungry. You’ve just had dinner. 你不会饿的。你刚吃过饭 can’t/couldn’t be can’t/couldn’t do , couldn’t语气较can’t稍弱对现在或将来情况作推测，意思是“不可能” It could rain later this evening. 今晚晚些时候也许会下雨。Mom will be downstairs now. 妈妈现在应该在楼下吧He would not be very happy. 他可能不会很高兴。He may not believe you. 他可能不会相信你。I was afraid she might be in bed now. 我担心她可能已经睡觉了。 She could be thinking about her test. 她可能正在想她的测试 will/would/should/can/could/may/might +be/do 对现在或将来情况作推测，意思是“可能”语气依次减弱 对现在、将来的动作推测 情态动词+be；情态动词+do； 对正在发生的动作推测 情态动词+be doing”。 总结 She may / might / could arrive before 5. She must arrive before 5. He must be listening to the radio now. He may/might/could be listening to the radio now. He can't(couldn't) be at home at this time. He may(might) not be at home at this time. 5:00前她可能/也许到。 5:00前她一定到。 他一定正在听收音机。 他可能/也许正在听收音机。 这个时候他不可能在家。 这个时候他可能不在家。 As she is not here, I suppose she must have gone home. 她既然不在这里，我料想她必定是回家了。They can’t have gone out because the light’s on. 他们不可能出去了，因为灯还亮着。She could have forgotten to tell him. 她可能忘记告诉他了He will have gone back to England. 他可能已回英国去了。She would not have noticed it. 她也许还没有注意到这事。She’s late. I think s