语法点六 情态动词can和 could-【培优计划·语法培优】2023-2024学年六年级下册英语（外研版）一起

六年级英语·下册 20 语法点六 情态动词 can 和 could 语法一点通 读一读，学会情态动词 can 和 could 的用法 含义：情态动词主要用以表明说话者对某一行为的态度 和观点,主要包括揣测、判断、需要、可能等。情态动词不 能单独作谓语,只能和动词原形一起构成谓语,没有人称 和数的变化。 链接教材功能句式： 1.I can carry the box. 我能拿这个盒子。 2.Who can help me? 谁能帮助我? 3.After that she couldn􀆳t see or hear. 在那之后,她看不 见也听不见。 情态动词can和could的用法区别 01 表示能力，意为“能够，会”。 can表示现在具备的能力,而could是can的过去式,表示过 去具备的能力。 例:I can jump high. The clever boy could speak English when he was four years old. 02 表示询问、请求及允许。 could在态度上要比can更客气,语气更委婉,更含有尊重之意。 例:Could you help me? 多学一点 1.当表示允许别人做 某事的委婉语气时, 用can而不用could。 例:—Could I use your pen? 我可以使用你的 钢笔吗? —Of course, you can. 当然可以。 2.can表示推测,常用 于否定句或疑问句中。 例:That can􀆳t be Mary. She􀆳s in hospital. 那不 可 能 是 玛 丽。她 在 医院。 六年级英语·下册 21 语法自主测 测一测，看你掌握了多少 Ⅰ.单项选择。 ( )1.—Excuse me, you tel me where the nearest bus stop is? —Sorry, I􀆳m new here. A.need B.could C.must ( )2.—Excuse me, which is the way to the bank? —Sorry, I don􀆳t know. But you ask the police. A.need B.can C.must ( )3.What your sister do when she was three years old? A.can B.could C.do ( )4.I run fast last year, but I now. A.could; can B.could; couldn􀆳t C.couldn􀆳t; can ( )5.—Could you help me? — A.Sorry, you couldn􀆳t. B.Sorry, I can􀆳t. C.No, you can􀆳t. ( )6.—Can I have ice cream, Mum? —Sorry, we don􀆳t have any. A.some B.any C.a Ⅱ.用can, could, can􀆳t, couldn􀆳t填空。 1.I speak some English now, but I speak little before. 2.She jump high before, but she jump high now. She is good at jumping. 3.The book be hers. There is her sister􀆳s name on the cover. 4.What you do when you were a baby? 5.— you carry this heavy box? —Yes, I􀆳m very strong. 6.He do it, but we can help him.