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Unit2 Healthy Eating(2)知识精讲 人教实验版
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Unit2 Healthy Eating(2)知识精讲 人教实验版一. 本周教学内容： Unit 2 Healthy Eating (2) 1. 语法：情态动词：ought to, have to, should, must以及need的用法情态动词综合练习 2. 构词法二. 教学重难点： 1. 情态动词ought to与should的用法should作为情态动词，表示“劝告”、“建议”，常译作“应该”。如：You should keep your promise.你应该信守诺言。Young people should respect old people.年青人应该尊重老年人。ought无人称和时态的变化，后接带to的动词不定式。ought to可表示“义务”、“要求”、或“劝告”，常译作“应该”、“应当”等。此时和should差不多，只是语气稍重一些。如：You ought to start at once.你应该立即开始。Such things ought not to be done.不应该做这种事情。（注意ought to的否定式的写法）ought to有时可以表示“非常可能”的意思，常用于第三人称中。如：——Ought he to go? 他有可能去吗？——Yes, he ought to. 是的，很可能。If she is completely well, she ought to be back at school today.如果完全康复的话，她很有可能今天来上学。2. must和have to should和ought to用来表示“劝告”，而must和have to则用来表示“强烈的要求”。上一节已经为大家介绍过must和have to的区别，这里大家还要体会它们与should及ought to的含义差别。下面来理解以下句子的含义及差别。You must eat a balanced diet to stay healthy.You should eat a balanced diet to stay healthy.You must get up early.You have to eat three meals a day if you want to be able to study hard.You must not eat the same kind of food at every meal.You needn’t eat meat every day. 情态动词练习题： 1. 用should, shouldn’t, must, mustn’t, needn’t, have to, don’t have to填空 1）Bill’s room isn’t very interesting. So he _______ put some paintings on the wall. 2）Susan drives every where and never walks. She ________ use her car so much. 3）We’ve got plenty of time. We _________ hurry.4）We have got little time. We ___________ hurry.5）You _________ play on the street. It’s dangerous.6）Must I do all the exercise today? No, you _________.7）____________ I finish my homework today? No, you needn’t.8）You _________ wait here. I will call you later. 2. 构词法 英语中有很多词汇是通过构词法形成的。通过了解构词法的内容，可以帮助我们更加容易地理解和记忆词汇。 1）构词法的分类及规则：............
