Unit 10 Water Festival Stage 2课件2022-2023学年牛津上海版七年级英语下册

Unit 10 Water Festival Reading: Preparing for the Water Festival 1 Review. How can we make iced fruit punch? 2 form n. 形态；形式 three forms of water: water, steam, ice freeze v. （使）冻结；结冰 turn into转变成；将……变成 When water freezes, it turns into ice. cool down变凉；冷却下来 When steam cools down, it turns into water. lid n. （容器的）盖；盖子 second n. 秒 1 minute=60 seconds Read the words and phrases for a few minutes. form n. 形态；形式 freeze v. （使）冻结；结冰 cool down 变凉；冷却下来 turn into 转变成；将……变成 lid n. （容器的）盖；盖子 second n. 秒 Read and answer Read ‘Look and read’ silently. Answer the following questions. (1) What happens when water boils? (2) What happens when water freezes? (3) What happens when ice melts? (4) What happens when steam cools down? It turns into steam. It turns into ice. It turns into water. It turns into water. Discuss the following questions in groups. (1) Put a dry lid on a glass of hot water. Wait for ten seconds. Take the lid off. What is under the lid? How does it happen? (2) Put some ice cubes in a glass of water. Wait for two minutes. Look at the outside of the glass. What is on the glass? How does it happen? Drops of water. The hot water in the glass turns into steam. The steam turns into drops of water on the lid. Drops of water. The steam in the air turns into water on the cold glass. Discuss Grammar 1. 含义及用法 when作连词，意为“当……的时候”，引导时间状语从句。when引导的时间状语从句，可以放在主句之前，也可以放在主句之后。 I loved English when I was at school. 我上学时喜欢英语。 When she was thirteen, she began to play the guitar. 她十三岁时开始弹吉他。 连词when 2. 时态 （1）当主句为一般将来时，when引导的时间状语从句用一般现在时表将来。 I will call you when I come back. 我回来时，会给你打电话。 When he comes, we will start the meeting. 他来了，我们就开始会议。 【拓展】当主句中含有情态动词或主句是祈使句时，when引导的时间状语从句也用一般现在时。 When you are ill, you must see a doctor. 你生病时，必须看医生。 Be careful when you cross the street. 过马路时，要小心。 （2）当主句为一般过去时，when引导的时间状语从句也用一般过去时。 When he was 7, he could swim. 他七岁时就会游泳了。 1. Three forms of water水的三种形态 form ①〔名词〕形态；形式；表格 in the form of...以……的形式 T