Unit 4 Section Ⅱ Using language（教师用书word）-2022-2023学年新教材高中英语选择性必修第二册【精讲精练】外研版

Section Ⅱ　Using language it用作形式主语 ①But it is vital not to take any chances. ②When I saw the tragic scenes on the news，I felt it was my duty as a doctor to go there and offer my help. ③It is important to remember that Ebola doesn't respect national boundaries. ④It is so inspiring to have colleagues like Hassan，Maisy，Alfonso，not to mention all the others I have worked with. ⑤In a world still facing so many problems，it is absolutely essential for us all to collaborate to create a global community with a shared future of peace and prosperity. 以上例句中的it作形式主语，指代后面的不定式短语。 当动词不定式(短语)、动名词(短语)或者从句作句子的主语时，通常用it(不能用that，this等词)来作形式主语代替它们，而将真正的主语放在后面，以保持句子结构的平衡。此时it只起先行引导作用，本身无词义。 一、it代替不定式(短语)作形式主语 it代替不定式(短语)作形式主语的常见句型： (1)It＋be＋adj.＋(for/of sb ) to do sth 如果此句型中的形容词描述不定式所表示动作的特征，介词用for；如果形容词描述的是人的品质、性格，介词用of。 As far as I'm concerned, it's necessary to have a good command of English. 就我个人看来，掌握英语是必要的。 It is very important for us to learn how to deal with stress. 学会如何应对压力对我们来说很重要。 It was really very kind of you to give me a lift home. 你让我搭便车回家， 真是太好了。 (2)It＋be＋n.(＋for sb/sth )＋to do sth It is a shame for us to have lost the game. 我们输了这场比赛，真丢人。 It is good manners for students to greet their teachers. 学生向老师打招呼是礼貌的行为。 (3)It takes sb some time to do sth 做某事花了某人……时间 It took them a year to build the bridge. 建这座桥花了他们一年的时间。 (4)It's up to sb to do sth 做某事是某人的职责或义务 It's up to us to help those in need. 帮助那些有困难的人是我们的重任。 [对点训练1] 单句语法填空 ①It is essential for you to accomplish the papers before Sunday. ②It's clever of you to work out the maths problem. ③It is necessary for high school students to learn (learn) another foreign Language. 二、it代替v.­ing(短语)作形式主语 it代替v.­ing(短语)作形式主语的常见句型： It's no use/no good/useless/a waste of time/...＋ doing sth It is no use giving him some advice. ＝It is useless giving him some advice. 给他提一些建议是没用的。 It is a waste of time doing such useless things. 做这样无用的事情等于浪费时间。 [对点训练2] 完成句子 ①如果你不会开车，有车也没用。 It is no use/useless having a car if you can't drive. ②医生告诉我们吃太多