Unit 4 Don’t eat in class
Unit 4 Don’t eat in class
Period 2: Section A 2d—3c (含 Grammar Focus ) Period 2: Section A 2d—3c (含 Grammar Focus ) Grammar肯定祈使句Sit down, please
Come in, please
Eat lunch at home
否定祈使句Don’t sit down
Don’t come in
Don’t eat lunch at home
•祈使句是用来表示请求、命令、叮嘱、号召或者劝告等的句子 , 这类句子的主语常是第二人称 you, 也就是听话者 , 因而 you 常省去
祈使句的开头是动词原形
Listen to music outside
Don’t listen to music outside
Do your homework at school
Don’t do your homework at school
{{如 : Look out
Wait here for me
Be sure to come here on time
务必准时来到这里
祈使句的否定形式多以 do not ( 常缩写成 don’t) 开头 , 再加上动词原形
•Don’t arrive late for school
•Don’t fight
•Don’t look out of the window
不要向窗外看
• 情态动词 have to 的用法:意思是“必须、不得不” , 它侧重于客观上的必要和外界的权威
•(1) 结构 : 主语+ have to +动词原形+其他 ( 一般现在时 , 主语是第三人称单数时has to; 句子是过去时用