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课件网) Unit 7 The secret of memory 主题范畴：人与自我；人与自然 主题群：生活与学习 子主题：自我认识，自我管理，自我提升；积极的学习体验，恰当的学习方法与策略，勤学善思；地球与宇宙探秘 Key question What does it take to remember something know more grammar rules of conditional sentences. distinguish the differences between conditional sentences with if (... not) and unless. use conditional sentences correctly. Learning objectives 学习目标 After learning, I will be able to: If you visit the park, you will have a lot of fun. The if-clause to talks about _____. a probable action The main clause talks about _____. the likely result 主 将 从 现 We have already learnt to use: Lead-in 1. If I work hard this evening, I will complete my research. 2. If you are happy and you know it, then your face will show it. 3. If you are happy and you know it, clap your hands. 4. If you turn on the lamp, the room becomes bright. 5. If you take a fish out of water, it dies. Pay attention to the sentences below. 句子结构： 从句部分: If +主语+ _____ 主句部分: 主语 + _____/_____/_____ 一般现在时 一般将来时 祈使句 一般现在时 Observe A Conditional sentences (2) We have already learnt to use conditional sentences to talk about probable results. We can also use conditional sentences to talk about results that will certainly happen. 我们已经学习了使用条件句来谈论可能的结果。我们也可以使用条件句来谈论一定会发生的结果。 Grammar P105 While-learning Read the passage below and pay attention to the words in bold. We can also use: 主 现 从 现 When we use a conditional sentence to talk about something that will certainly happen, both verbs should be in the simple present. Let’s sum up the rules! P105 当我们用条件句谈论一定会发生的事情时，主句和从句中的动词都用一般现在时。 Summary: Conditional sentences (2) 一、结构 当表示条件和结果之间存在必然联系，即表示客观事实、结果时，if条件句 主句结构：_____， 从句结构：_____。 ① If the temperature is below zero, water turns into ice. 如果温度低于零度，水就会变成冰。 ② If you throw something into the air, it falls back to the ground. 如果你向空中抛东西，它就会回落到地面。 主语+一般现在时 If +主语+一般现在时 二、位置 * if 从句可以放在_____，也可以放在_____。 * 如果把 if 从句放在_____，常用_____将其与主句隔开。 Water turns into ice if the temperature is below zero. 主句之前 主句之前 主句之后 逗号 = If the temperature is below zero, water turns into ice. Look! If you put salt into water, it disappears. = Salt disappears if you put it into water. We can also put the if-clause after the main clause. 巧记绕口令 if 引导的条件状语从句歌 if条件句不一般， 几个要点记心间。 条件句放在前， 逗号要放句中间。 条件句表可能， 主句多用将来时； 条件句表事实， 主句常用现在时。 if条件句有特点， 现在时把将来替； 这个规则要牢记! Read these if-clauses and match them with the results. P105 Make conversations according to the sentences below. 1 S1: What happens if you switch off the lamp S2: The room becomes dark. ... ...
