选修六Unit4Globalwarming——全球变暖.ppt

①You may borrow the book so long as/as long as you keep it clean.只要你不把书弄脏，就可以借给你。 ②I don’t care about the price so_long_as the car is in good condition.我不计较价钱，只要车很好用就行了。 【温馨提示】　as long as 只能用于肯定句，而so long as既可用于肯定句又能用于否定句。as long as 还可意为“与……一样长，长达……”。 ③I think the train leaves at midday.You’d better take a taxi.If not,maybe you’ll miss it. 我想火车是正午开，你最好打的去，否则可能会误车的。 ④Have you got a free evening next week？If_so，let’s have dinner together. 下周你哪个晚上没事？如果没有事，我们去吃饭吧。 ⑤Take this camera with you，if necessary. 如果有必要，带上照相机去吧。 跟踪训练 1．(2012·湖南长沙长郡中学月考)If the food tastes nice，we’ll buy some；if ________，________. A．no；no B．not；not C．not；no D．no；not 解析：选B。考查省略。全句应为：If the food doesn’t taste nice，we won’t buy any。 2．Perseverance is a kind of quality－and that’s what________to do anything well. A．one takes B．one is taken C．it takes D．it is taken 解析：选C。句意为：毅力是一种品质，是一种做好任何事情都需要的品质。表语从句中隐含一个句型：It takes ...to do sth.。 3．(2012·郑州六校质量检测)My students，__________ you have a heart loving life，you always can find things that would make you happy each day. A．as long as B．if only C．as though D．even though 解析：选A。考查连词用法。句意为：我的学生们，只要你们有一颗热爱生活的心，你们每天总能发现让你们开心的事情。as long as表示“只要”。后三项分别表示“但愿”“似乎”“即使”，都不符合句意。 4．(2012·江西省九江市第二次联考)__________ I know，the computer can never take the place of the human brain. A．Even if B．In case C．As long as D．As far as 解析：选D。考查状语从句。根据语意判断选D，as far as引导状语从句时,意为“就……而言”，as far as I know意为“据我所知”。句意为：据我所知，电脑永远也代替不了人脑。 本部分内容讲解结束 按ESC键退出全屏播放 ①(牛津P386)Can you tell me how the accident came_about？你能告诉我事故是怎样发生的吗？ ②I’ll never understand how it came about that you were an hour late on such a short journey. 我真不明白这么短的路程你怎么会迟到一个小时。 辨析come about/happen/take place/break out come about “发生，产生”，通常与how连用。 happen “发生”，指偶然的、意外的事情发生。 take place “发生”，指事件或事故的发生是在预料中，进而引申为按计划“进行，举行”。 break out 指战争、火灾、疾病等的突然“发生，爆发”。 巧思妙解 用come about，happen，take place，break out填空 (1)A fire ____________during the night and caused a great damage. broke out (2)Luckily the earthquake didn’t ____________in th