江苏省连云港市灌云县四队中学高中英语 Unit2 Grammar学案巩固案2 牛津译林版必修2(1).doc

灌云县四队中学学案巩固案studying aims: to learn how to use it as an empty subject and object.self education (自主学习)revision: what is the function of“it” in the sentences below ?1. its a book. ( )2. its ten oclock. ( )3. its raining outside. ( )4. its a long way to the museum. ( )team work (合作探究):task 1 形式主语it1) 替代不定式短语作主语。如：it was his duty to attend to the matter. 处理这件事是他的责任。_ is impossible _. 准时完成工作是不可能的。2) 替代动名词作主语。如：it is useless crying over the spilt milk. 覆水难收。_ no use _. 再说这件事没用。3) 由于主语从句位于句首，句子常显得笨重，因此常把它移至句子后部，句首用引导词it来作形式主语，替代主语从句。如：it is a pity that she has made such a foolish mistake. 他犯了如此愚蠢的错误，真遗憾。_ is reported _.据报道，三个人在这次交通事故中遇难。task 2 用作形式主语it的重要句型 it替代动词不定式作主语的常见句型： it + be + adj. + for (of) sb to do sth 某人做某事it is hard for him to make up his mind. 他很难下定决心。it was foolish of her to say such a thing. 她说那样的话，真是太蠢了。【想一想】如何选择上述句型中的介词of和for ? it takes sb + 时间段 + to do sth. 某人做某事花了时间it takes years to master a new language. 要花多年的时间才能掌握一门新的语言。_我写这封信花了一个小时。it替代动名词作主语的常见句型：its no good/use doingits useless doingits (well) worth/worthwhile doing it替代主语从句的常见句型： it + be +adj. +that从句it is clear that he mistook me for my younger sister. it + be + 过去分词 + that . = sb./sth. + be+过去分词+to do it is believed that china has become one of the strongest countries in the world.= china is believed to have become one of the strongest countries in the world. it + be +n. +that从句it is a fact that english is being accepted as an international language. it looks (seems, appears, happens, occurs) that = sb. looks/seemsto do sth.a. it seems that he speaks two languages. = he seems to speak two languages.task 3 形式宾语it如果宾语从句后面有宾语补足语，则用it作形式宾语，将从句后置。we must make it clear that anyone who breaks the law will be punished.i find it necessary that we should do the homework. conclusion:此时，句子结构通常为：谓语动词+形式宾语it+宾补+宾语从句target detection（目标检测）: 1i like_ in the autumn when the weather is clear and bright. a. thisb. that c. it d. one 2、the chairman thought _ necessary to invite professor smith to speak at the meeting. athat bit cthis dhim 3. is_