(
课件网) UNIT 5 THE VALUE OF MONEY Section Ⅱ Discovering Useful Structures ●语法概览 ●语法精讲 一、情态动词 (一)常见情态动词的用法 1．can/could (1)表示能力，意为“能，会”；could主要指过去的能力。 I see what you mean, these days you can see traffic jams around schools that drop off at pick-up times, but it's hard to blame the parents. 我明白你的意思，现在你能够看到学校周围的交通堵塞，在接孩子的时候下车，但是很难责怪家长。 (2024·新课标全国Ⅰ卷)And the low temperatures could bring snow to the forest area. 低温会给森林地区带来积雪。 (2)表示请求或许可。 当请求允许做某事时，两者均可用，但用could语气更委婉。当表示允许某人做某事时，一般要用can，而不用could。 —Could you check this bill for me I don't think it's right. —Certainly. ———你能帮我检查一下这个账单吗？我认为它不对。 ———当然。 (3)表示惊异、怀疑、不相信等态度时，意为“怎么能，怎么会”，主要用于否定句、疑问句或感叹句中，用could时语气较委婉。 How can you stay so calm after such a hot argument 在如此激烈的争论之后，你怎么还能保持如此冷静？ can与be able to的区别 ①can只能用在一般现在时，而be able to可用于更多的时态。 (2023·浙江1月卷)She was covered in spider-webs and was barely able to move her wings. 她全身都是蜘蛛网，几乎不能动翅膀。 ②表示过去特定的能力或经过努力才具备的能力，只能用be able to。 I talked with her for a long time, and finally I was able to make her believe me. 我和她谈了很长时间，最终，我让她相信了我。 2．must 表示现在或将来必须要做某事，多是出于义务、责任或强制命令，指说话人的主观意志。 (2024·新课标全国Ⅰ卷)Groups of five or more require special arrangements and must be confirmed in advance. 五人或五人以上的团体需要特别安排，必须事先确认。 (2022·新课标全国Ⅰ卷)If you plan on working out in a gym, that person must belong to the same gym. 如果你打算在健身房锻炼，那个人必须是同一个健身房的。 must用法点拨 (1)回答must引出的问句时，如果是否定的回答，不能用mustn't，而要用needn't或don't have to。 —Must we hand in our English exercise books 我们必须交英语练习册吗？ —Yes, you must.(No, you don't have to./No, you needn't.) 是的，你们必须交。(不，你们不必)。 (2)must用于疑问句中，可以用来表示责备、抱怨的感彩，意为“偏要，硬要”。mustn't的意思是“禁止”，而不是“不必”。 Must you play the guitar so loudly I can't concentrate my attention on my work. 你非要这么大声弹吉他吗？我无法把注意力集中在工作上。 用适当的情态动词填空 ①—_____ I finish the paper today —No, you needn't.You can hand it in next week. ②(2023·新课标全国Ⅰ卷)You _____ use the following writing exercise to help you do this. ③(2023·新课标全国Ⅱ卷)They _____ not afford to pay for transportation for their dog, Tiffy, and desperately wanted to take her with them. ④Why _____ you argue with each other every day Must can could must 3．may/might (1)表示请求时，两者都可用，只是 might 表示的语气较委婉(但并不表示过去)；表示许可时，通常要用 may而不用might。 If it is convenient, may/might I pay you a visit at your office next Tuesday 如果方便的话，我可以下周二到办 ... ...
