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some are not good. 我們所做的, 有些對(duì)地球很好,而有些不利。6. They can also prevent the water from washing the earth 。7. When it rains or when the wind blows, the earth is taken , 土就會(huì)被沖走或刮走。III. 語(yǔ)法不定代詞:1. 定義: 指的是那些不指明代替任何特定名詞或形容詞的代詞。2. 用法: 在句中可作主語(yǔ)、賓語(yǔ)、表語(yǔ)、定語(yǔ)等。something , somebody, anything, anybody等作主語(yǔ)時(shí),通常視為單數(shù)。當(dāng)形容詞修飾它們時(shí),要放在其后。. But the government has done something useful to protect the environment.Topic 3 Would you like to be a greener person?I. 重點(diǎn)詞組1. not only…but also… 不僅……而且……2. be supposed to 應(yīng)該3. ought to 應(yīng)該4. turn off 關(guān)掉5. instead of 代替6. on time 準(zhǔn)時(shí)7. make sure 確保8. push forward向前推9. push down 向下 up 向上拉II. 重點(diǎn)句型1. For example, we should use both sides of paper and reuse plastic bags. 例如,我們應(yīng)該用紙的兩面,并且重新使用塑料袋。2. Everyone is supposed to do .3. First, you ought to turn off the lights when you leave a , 你離開(kāi)房間時(shí)應(yīng)該隨手關(guān)燈。4. Easier said than done. 說(shuō)起來(lái)容易做起來(lái)難。5. Well, actions speak louder than , 百說(shuō)不如一做。6. There will be a lot of hard work to do tomorrow, so make sure you go to bed early tonight.明天有許多繁重的活要干,今晚一定要早睡。III. 語(yǔ)法并列句: 由兩個(gè)或兩個(gè)以上并列而又相互獨(dú)立的簡(jiǎn)單句構(gòu)成。結(jié)構(gòu)為: 簡(jiǎn)單句+并列連詞+簡(jiǎn)單句常用的并列連詞有:and, or, but, while, not only… but also. 1. The river is dirty and the temperature of the earth is rising.2. They work well, but they are slow and can’t run for long. 5