Unit 4 Don't eat in class 单元语法清-【四清导航•辽宁专版】2022-2023学年七年级英语下册作业课件(人教版)

英语 七年级下册 人教版 四清导航 单元语法清 语法精讲 一、祈使句 1．祈使句的肯定句 (1)Do型：动词原形(＋宾语)＋其他． (2)Be型：Be＋表语＋其他． (3)Let型：Let＋宾语＋动词原形＋其他． 2．祈使句的否定句 (1)Do型：Don't＋动词原形(＋宾语)＋其他．　 (2)Be型：Don't＋be＋表语＋其他． (3)Let型：Don't＋let＋宾语＋动词原形＋其他．/Let＋宾语＋not＋动词原形＋其他． (4)No型：No＋v.­ing/名词． 二、情态动词have to和must的用法 1．have to和must都表示“必须”，have to强调客观需要，意为“不得不”。must强调说话者的主观意愿。如： It's too late.I have to take a taxi.太晚了，我不得不乘坐出租车。 I must go now，or I will be late.我必须现在就走，否则就要迟到了。 2．have to可以用于不同的时态，有人称和数的变化。must一般表示现在，无人称和数的变化。如： She has to wear a uniform at school.她必须在学校穿校服。 We must work hard.我们必须努力工作。 3．don't have to表示“不必”，mustn't表示“不准；禁止”。如： You don't have to get up early on weekends.周末你不必早起。 You mustn't swim in the river.你不准在河里游泳。 语法精练 一、单项选择。 ( )1.—What are the rules at your school? —Don't run in the hallways and ________ arrive late for class. A．not to B．must C．don't D．no ( )2.Let him ________ play in the street. A．don't B．doesn't C．to D．not C D ( )3.There is a sign(标牌).It says “No ________”． A．parking B．park C．parks D．to park ( )4.You ________ cross the street when the traffic lights(交通灯) are red. A．needn't B．don't have to C．mustn't D．isn't ( )5.—________ your teeth after getting up，Tony. —OK，Mom. A．Brush B．Brushes C．To brush D．Brushing A C A 二、句子翻译。 根据所给中文完成句子翻译。 6．不要在图书馆拍照。 in the library. 7．吉姆不得不在学校吃午饭。 Jim eat lunch at school. 8．在周六你不必洗餐具。 You do the dishes on Saturdays. 9．让我帮助你吧！ Let me help you! 10．我们必须每周一穿校服。 We must wear school uniforms every Monday． Don't take photos has to don't have to $$