Unit 2 Transportation 祈使句课件-2023-2024学年中职英语高教版（2021）基础模块1

祈使句 Come earlier next time. Don’t speak so loud. Go and tell her. Don’t be late. Have a good time. Be quiet. Let’s eat out tonight. Be confident. Let me have a try. 祈使句是表示请求、命令、劝告、祝愿或建议的句子。祈使句的主语一般为第二人称，但往往省去不用。 Come earlier next time. Don’t speak so loud. Go and tell her. Don’t be late. Have a good time. Be quiet. Let’s eat out tonight. Be confident. Let me have a try. 祈使句的形式 肯定结构: 1.Do型(即:动词原形+其它成分). Go straight. Take the second turn on your right. Walk along the street and turn left at the third teaffic light. 2.Be型(即:Be + 名词或形容词+其它成分). Be yourself. Be careful. Be a good student! 3.Let型(即:Let + 宾语 + 动词原形 + 其它成分). Let’s play football！ Let me help you. Let's take a taxi. 补充 1.Do 有时为了加强语气，可在动词前加do。如： Do be careful. 务请小心。 Do come on time. 务必请准时来。 2.Please 为了使祈使句的语气变得委婉，可以在祈使句的句首或句末加上please——若加在句首，其后不用逗号;若加在句末，则通常会在please前加一个逗号。 请把窗户打开。 Open the window, please. Please oped the window. 否定结构: 1.Do型和Be型的否定式都是在句首加don't构成. Don't forget me!不要忘记我! Don't be late for school!上学不要迟到! 2.Let型的否定式有两种:“Don't + let + 宾语 + 动词原形 + 其它成分”和“Let + 宾语 + not + 动词原形 + 其它成分” Let her come in. Don't let her come in. Let her not come in. 3.有些可用no+动名词,用来表示禁止性的祈使句. No smoking!禁止吸烟! No fishing!禁止钓鱼! 巧记祈使句 祈使句，无主语，只要动词就可以 表请求，或命令，加上please表客气 如要变成否定句，don't开头莫忘记 Go straight. Don't go there by bike. It's