【讲练结合】六年级下册英语Unit 4 Road safety语法划重点 译林版三起

【讲练结合】六年级下册英语Unit 4 Road safety语法划重点（含答案） 1. 语法精讲 一：情态动词的用法： 情态动词没有人称和数的变化，不能单独使用。其后必须跟动词原形，它们的否定式后同样跟动词原形。 二：情态动词归纳 1. 情态动词有四类：①只做情态动词：must, can(could),may(might) ②可做情态动词又可做实义动词：need, dare（敢） ③可做情态动词又可做助动词：shall(should),will(would)④有情态动词特征：have(had) to 2．must和have to的区别　　1) 表示主观上的必须、必要。You must come in time. 　mustn’t意思是“禁止， 不准”。 You mustn’t play football on the road.你不准在路上踢足球。 　　2) have to则强调客观需要。Must只有一般现在时， have to 有更多的时态形式。 2. 专题训练 一、选词填空-句子 should，shouldnˈt，must，mustnˈt，neednˈt，canˈt，may，have to填空。 (1) —Do we          go to school today? —Yes, you must. (2) Look at the sign. You          throw litter around here. (3) —          I ask you some questions, Dr. Li? —Sure. (4)They          do their homework. Itˈs too difficult. (5) If you want to be thinner, you          eat less meat. (6) You           watch too much TV. Itˈs bad for your eyes. 二： can may should canˈt must couldnˈt have to (1) There            be somebody playing the guitar in the park. It sounds beautiful. (2) We            help others to make the world better. (3) Jim _______play football, but he can play basketball. (4) They           take the train to Beijing tomorrow, but Iˈm not very sure. (5) I            get up early to catch the early bus on weekdays. (6) I           dance and sing very well. I am interested in music very much. (7) Jill had a stomachache so he            run quickly. 三：句型转换 (1) Students can run and talk loudly in the hallways.（改为否定句） Students _________ run _________ talk loudly in the hallways. (2) Maria has to play the piano on Sundays.（改为一般疑问句） _________ Maria _________ _________ play the piano on Sundays? (3) You can’t eat in the classroom.（改为否定祈使句） _________ _________ in the classroom.(4) You must look after your sister.（改为同义句） You _________ _________ look after your sister. (5) They have to clean the classroom every day.（对画线部分提问） _________ _________ they have to _________ every day? (6)Bob should eat something. （变否定句）   Bob ________ eat ________