四年级英语上册Unit 5《Safety》Lesson 2
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四年级英语上册Unit 5《Safety》Lesson 2 Look,listen and repeat. Be careful!Use the sidewalk. OK! Please wait for the green light.It's safe. OK!Thank you. sidewalk人行道 Please walk on the sidewalk. 请走人行道。 巧记： side旁边+walk走=sidewalk人行道 wait for等待 Please wait for me at the bus stop. 请在公交车站等我。 拓展：wait等待 light灯 The lights in this street are very beautiful. 这条街道上的灯非常漂亮。 复数：lights 形近词：right对的 night夜晚 eight八 派生词：lighter打火机 转化：light点燃，点着 合成词：flashlight手电筒 safe安全的 Please wait for the green light. It's safe. 请等待绿灯。它是安全的。 形近词：save挽救 派生词：safety安全 反义词：dangerous危险的 合成词：safeguard保护；捍卫 OK!Thank you. 好的！谢谢你。 Father:Be careful!Use the sidewalk. Daughter:OK! Policeman:Please wait for the green light. It's safe. Man:OK!Thank you. 祈使句的特点及类型 课文应用： Be careful!Use the sidewalk. 当心！使用人行道。 祈使句是用来表达命令、请求、劝告、 警告、禁止等的句子。 祈使句的特点： （1）祈使句通常省略主语（you），但是要想指明服从这项命 令的人，可以在祈使句的前面或后面加上姓名或称呼。 （2）祈使句里使用的动词一般用动词原形。 （3）祈使句主要用于要求对方（第二人称）做某事，当对第一人称 或第三人称有所命令时，要用Let型祈使句。 例如：Let him clean the classroom. 让他打扫教室吧。 （4）please可以用于祈使句的开头或末尾，表示委婉语气，在含有 don't的否定句中，please用在don't的前面或句末。 例如：Please sit down.请坐。 Please don't jump in the room=Don't jump in the room，please. 请不要再房间里跳。 祈使句的用法 祈使句主语常省去，只用谓语就可以。 表示请求或命令，加上please表客气。 如果变成否定句，加上don't是规律。 Look，think and role-play Be careful!Please wait for the green light. It's safe. 当心！请等绿灯。它是安全的。 OK!Thank you. 好的！谢谢你。 Don't read in the street. 不要在街上读书。 It's dangerous. 它是危险的。 OK!Thank you. 好的！谢谢你。 The light is green.Please go. 是绿灯了。请走吧。 OK! 好的！ Don't play football in the street. 不要在街上踢足球。 It's dangerous. 它是危险的。 Be careful!Use the sidewalk.It's safe. OK!Thank you. Ask and answer Look,ask and answer. Fire safety In the forest At home What mustn't we do...? We mustn't... smoke play with matches play near fires Look and learn Don't start campfires. =We_. Don't play near fires. =We_. Don't play with matches. =We_. Match and say In the forest At home At school a Don't smoke. b Don't play with matches. c Don't start campfires. d Don't play near fires. Fire can start in/at... We must be careful. In/At...We mustn't... Let's write Be careful!Use the_. Please wait for the_.It's safe.
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