Lesson 16: How Safe Is Your Home?I. Learning aims:Master the new words: prevent, themselves, slip, baking, soda, salt, knife, poison, heat, burn, bathtub II. Learning important and difficult points: 1) Many people hurt themselves by falling off chairs.2) Dont use water to put out kitchen fires.3) Never use electricity in the shower or bathtub.4) Its easy to slip and fall on a wet floor.Language Points:1. heat【用法】作不可数名词，意为“热、热度”。【举例】The sun gives us light and heat. 太阳给了我们光和热。【用法】作及物动词，意为“使温暖、加热”。【举例】Danny heated the water just now and it is hot now. 丹尼刚才把水加热了，现在水热了。2. Many people hurt themselves by falling off chairs. 很多人由于从椅子上落下来而伤到自己。【用法】句式by 加动名词或动名词短语，意为“通过、由于”，在句中作状语，表示原因或方式。【举例】Lisa learns English by listening and speaking. 丽萨通过听和说学英语。3. Its easy to slip and fall on a wet floor. 在潮湿的地板上很容易滑倒和摔跤。【用法】不定式作主语时，往往用it作形式主语，而将不定式放在后面。这句话中的主语是to slip and fall on a wet floor, it是形式主语，is是系词，easy是表语。【举例】To hear your voice is so nice. = It is nice to hear your voice. 听到你的声音真高兴。 To learn English well is very important. = It is very important to learn English well. 学好英语很重要。【举例】It is too late. Please stop playing games. 时间很晚了。请不要玩游戏了。1