Unit 4 Breaking boundaries Section Ⅱ　Using language—Grammar & Integrated skills课件(共73张PPT+ 学案）

英语　选择性必修 第二册 WY Section Ⅱ　Using language—Grammar & Integrated skills Grammar (it作形式主语) ①It's impossible for this country to recover in a short time over this financial crisis. ②It is no use talking to them. ③It is said that he stole the money. (1)在①句中it用作形式主语，是“It is＋形容词＋(for sb)动词不定式(短语)”结构，it指代_____。 (2)句②是“It is＋no use＋动名词(短语)”结构，it指代_____。 (3)句③是“It is＋过去分词＋that从句”结构，it指代_____。 答案：(1)动词不定式(短语)　(2)动名词(短语)　(3)that从句 it常代替由不定式(短语)、动名词(短语)或从句表示的真正主语，作形式主语，真正的主语在句子末尾出现。 一、不定式(短语)作真正的主语 1．It＋is/was＋形容词＋不定式(短语) 常用于此句型的形容词有：obvious, possible, strange, natural, important, difficult, necessary等。 It is impossible to get there by boat. 坐船不可能到那里。 It's very kind of you to help me. 你能帮助我真好。 It was nice to see Steve again. 很高兴又见到了史蒂夫。 名师点津 for/of：引出不定式的逻辑主语。形容词表示人的品质、特征时，介词用of；形容词描述不定式动作的属性和特征时，介词用for。 单句语法填空 ①It was very foolish _____ the boy to swim in the river alone. ②It's necessary _____ you to know about the Yangtze River, one of the mother rivers of Chinese civilization. ③It's clever _____ you to work out the maths problem. 答案：①of　②for　③of 2．It＋is/was＋名词词组＋不定式(短语) 常用于此句型的名词词组有：a duty, a pity, a fact, a wonder, a shame, an honour, no wonder等。 It was her duty to clean the room. 打扫房间是她的职责。 3．It＋is/was＋介词短语＋不定式(短语) It was against my principle to do that. 那样做违反了我的原则。 4．It＋及物动词＋宾语＋不定式(短语) It cost me 300 yuan to buy this dress. 买这条裙子花了我300元。 单句表达 ①我急需提高我的英语口语，因此对我来说找到一个可以与之学习的当地人真是太好了。 I badly need to improve my oral English, so _____ for me _____ a native speaker to learn from. ②瞪着眼睛看人是不礼貌的。 It is _____ at people. ③此事由您来处理。 It _____ handle this matter. ④建这座桥花了他们一年的时间。 It _____ them a year _____ the bridge. 答案：①it is great; to find　②bad manners to stare　③is up to you to　④took; to build 二、动名词(短语)作真正的主语 1．It＋is/was＋no＋名词/名词短语＋动名词(短语) 常见表达：It's no use/no good/no fun/a waste of time doing sth做某事没有用/没有好处/没有乐趣/没有用/浪费时间。 It is no use giving him some advice. ＝It is useless giving him some advice. 给他提建议没用。 2．It＋is/was＋形容词＋动名词(短语) It is pleasant sitting here. 坐这里很高兴。 单句表达 ①那样做真是浪费时间。 It is _____ doing that. ②试图用武力解决问题是没用的，和谈才是唯一的办法。 _____ to solve the problem by force; peace talks are the only solution. 答案：①a waste of time　②It is useless/no use trying 三、从句作真正的主语 1．It＋is/was＋形容词(如：strange/natural/surprising/obvious/true/fortunate/wonderful/funny/possible/impossible/likely/unlikely/clear/unusual/certain/important ...)＋从句 It's natural that she knows everything ... ...