第二部分 必修三 Unit 4 Astronomy the science of the stars.ppt

* * * * * * 1．This produced a chain reaction, which made it possible for life to develop. 这引起连锁反应，使得生命开始发展成为可能。 (1)这是“make it＋形容词/名词＋to do sth.”句型。该句型中it 为形式宾语，指代后面的不定式结构，形容词或名词为宾语补足语。 People in the west make it a rule to buy Christmas presents for their relatives and friends. 在西方，人们常在圣诞节时购买礼物给亲属和朋友。 (2)it 作形式宾语，除指代不定式结构外，还可指代that引导的宾语从句。 They made it clear to the public that they did an important and necessary job. 他们向公众表明：他们所做的工作重要且必不可少。 (3)make 复合结构的主要用法如下： [多维演练] A：用所给动词的适当形式填空 ①The boss made us (work) for him 16 hours a day. ②The teacher raised his voice so that he could make himself (hear)． ③We find it impossible (climb) to the top of the hill in such bad weather. work heard to climb B：翻译句子 ④他的帮助使得许多穷孩子上大学成为可能。 His help made it possible for many poor children to attend college. C：单项填空 ⑤(2010·辽宁高考)The fact that she was foreign made difficult for her to get a job in that country. A．so B．much C．that D．it 解析：考查it的用法。句意：她是外国人的事实使得她在那个国家很难找到工作。句中for her to get a job in that country 是动词不定式的复合结构做made 的宾语，difficult是宾语补足语，此处要用it做形式宾语，其他词没有这种用法。 答案： D 2．Walking does need a bit of practice now that gravity has changed. 既然重力改变了，走路也确实需要练一练了。 now that“由于；既然”，引导原因状语从句，有时that可以省略。 Now that we know the forest and savanna elephants are two very distinct animals, the forest elephant should become a bigger priority for conservation purpose. (选自2011年高考湖南卷·阅读C) 既然我们知道非洲森林大象与非洲草原大象是两种不同的物种，那么非洲森林大象更应该优先成为受保护的对象。 Now that you are busy tomorrow. I wont call you up then. 既然你明天忙，我就不给你打电话了。 [个性比较]　now that, because, since, as, for now that 说明已经成为事实的原因，常译为“既然” because 语气最强，回答的是用why提问的问句，表示直接的或为人所不知的原因 since 表示间接附带的众所周知的原因，意为“既然”，常放在句首 as 表示一种明显的、已知的理由，意为“由于” for 是并列连词，用来补充说明理由或提供一种解释，不一定是真正的原因，不能放在主句前面 [多维演练] A：选词填空(now that, because, for) ①— Why did you do this? — it is good for you. ②He must be ill, he was absent today. ③ you have finished your work, you can have