Unit 5 The Value of Money Part 3 Discovering usefu structures-课件(22张ppt)-2021-2022学年下学期高一英语同步精品课堂(人教2019必修第三册)

Unit 5 The Value of Money Part 3 Discovering Useful Structures Learning aims 1. To review the meanings and functions of some modal verbs; 2. To summarize the meanings of the two forms of past future tense; 3. To express modality and talk about future events Learning aims Grammar --modal verbs 一、定义：情态动词是一种本身有一定的词义，但要与动词原形一起使用，给谓语动词增添情态色彩，表示说话人对有关行为或事物的态度和看法，认为其可能、应该或必要等。 情态动词可以表示可能、建议、愿望、必要、允许、能力等。 2.情态动词没有人称和数的变化。 3.情态动词必须和实义动词一起构成谓语。 4.情态动词除ought和have外，后面只能接不带to的不定式。 5.情态动词没有非谓语形式，即没有不定式、分词等形式。 I. Review of modal verbs 二.常见情态动词、其否定式、其缩略形式 : 情态动词 否定式 缩略形式 can could may might shall should 情态动词 否定式 缩略形式 will would must had better ought to can not/ cannot can't could not couldn't may not / might not mightn't shall not shan't should not shouldn't will not would not must not had better not ought not to won't wouldn't mustn't oughtn't / 4. 相当于情态动词的: 1.只作情态动词的： 2. 可情态可实义的： 3. 可情态可助动词的: 三、情态动词的分类 can/could, may/might, ought to