1、unit9语法知识讲堂情态动词can的用法can是一个常用的情态动词，其后跟动词原形。can的否定形式为cannot(缩写形式为cant)。其用法如下1.can表示能力，意为“能，会”，可与be able to互换。但是be able to可用于多种时态，而can只能用于一般现在时和一般过去时。I cant swim. 我不会游泳Lily can speak a little French. 莉莉会说一点儿法语They will be able to go to shanghai in three months. 他们在三个月后就能去上海了2.表示可能性，意为“可以，可能”That big c
2、inema can hold 2000 people. 那家大电影院能容纳2000人He can be very friendly at times. 有时他可能很友好3.表示允诺，意为“可以，能够”You can read the book when I have finished it. 我把书看完了你就可以看了Can I use your pen? 我可以用你的钢笔吗？4.表示惊异、不相信等（用于疑问句、否定句或感叹句中）意为“会，可能”It cant be true. 这不可能是真的Can it be true? 这可能是真的吗？如何发出、接受和谢绝别人的邀请1.发出邀请的常用句型：C
3、an you.?Could you.? 你可以/能/愿意.吗Would you like to .?Would you like to have dinner with us? 你愿意和我们一起吃晚饭吗？Id love to. 我很乐意2.接受邀请的常用答语Sure. 一定/当然可以。Certainly. 当然可以OK. 行/好吧。Id love to. 我很乐意3.谢绝邀请的常用句型Im sorry, I cant. I cant. I have to. 对不起，我不能。我不得不.Im afraid I cant. I have to. 我恐怕不能。我不得不.Id love/like to,
4、 but. 我很愿意去，但是.【即时演练】1. I help you, sir?Yes. I want a T-shirt. A.Can B.Should C.Must D.Would2.Pauline has lost her phone.No. Its in her bag. I hear it.A.must B.can C.may D.shall3.Sandy, we need an actor for the action movie. you play kung fu?Sorry, I cantA.neednt B.cant C.can D.may4.Hi, guy! You park your car here. Its for our customers only.A.neednt B.cant C.can D.may5.Would you like to come to my party this evening? .But I have to study for my math test. A.My pleasure B.Id love to C.Thats all right D.Dont mention it【参考答案】1.A 2.B 3.D 4.B 5.B
