1、Unit4 Topic2 SectionA 精品学案预习热身。翻译：A:life in space_ travel by spaceship_in order to (do)_B:in the future_ on the earth_What fun!_ will be able to_C:A wonderful movie will be shown tonight._We will be able to do anything that can be done on the earth._I dont think aliens can be found in space._I wont
2、believe there are aliens until I see them with my own eyes._二：重难点释疑。1.We will be able to do anything that can be done on earth. 思考：that can be done on earth是_从句，修饰先行词_点拨：can be done 能够/可以被做(带有情态动词的被动语态)。练习：.这些树明天必须被栽种。These trees _ _ _ tomorrow.2. They are reading information on the Internet in orde
3、r to learn about human culture. 他们正在互联网上阅读资料，以便了解人类的文化。点拨：in order to (do) 为了 (后接目的状语)，否定形式 in order not to (do) 链接：so that 为了 (后接目的状语从句)。练习：1.为了能赶上早班车今天早上他起床很早。He _ _ early _ _ he _ _ the early bus this morning.2.为了提高口语他去年去了英国。He went to England last year _ _ _ _her oral English.3.I dont think alie
4、ns can be found in space. 我认为在太空中找不到外星人。点拨: 主语(第一人称)+think/suppose/believe/imagine/expect，后面宾语从句中的否定词not要前移到主句，即_ 注意：这种含有否定前移复合句的反意疑问句部分要与从句一致. 练习：a .I expect they can make progress in English.(变否定句) _ b.我相信他不会回来. I _ _he _ _ back.c.我认为明天不会下雨.I _ _ it _ _ tomorrow,.4.I wont believe there are aliens
5、until I see them with my own eyes.除非亲眼所见，否则我也不相信有外星人存在。点拨: notuntil 直到才(until引导了时间状语从句)，从句中要遵循主将从现的原则。对比：until 和notuntil 分析：a. They kept waiting for her until she came back. b. They didnt leave until she came back. 总结：until前面主句的谓语动词是_; notuntil前面主句的谓语动词是_练习：1.昨天晚上直到完成作业我才睡觉。I _ go to bed _ I _ my homework last night.2.明天我会一直等到你回来。I _ _ _ you _ you _ back tomorrow.
