优化指导13-14学年高二英语课件（人教版，选修6）unit3Ahealthylife-section4GrammarWriting.ppt

;it的用法(Ⅰ) 一、代词it;用　法;二、引导词it 1．it 在句中作形式主语;温馨提示：it 作形式主语没有具体的意义，只是把真正的主语移至句子的后面，避免头重脚轻。 it 作形式主语的常见句型： ①It is＋形容词(＋of/for sb.)＋to do sth. ②It is＋形容词(important，right，strange，clear， natural...)＋that ＋sb.＋(should)do sth.(虚拟语气) ③It is no use/good＋doing sth. ④It is said/reported/announced/(well)known...that...;⑤It is a pity(a shame，a fact，a wonder，an honour，one’s duty...)that It is important that we should pay close attention to the situation. 我们密切关注形势的发展是很重要的。 It is no use trying again.再尝试也没有用处了。 It’s a pity that you didn’t pass the exam. 你考试不及格真遗憾。 It’s well-known that Taiwan belongs to China. 众所周知，台湾是中国的一部分。 It’s a good idea to go for a walk on weekends. 周末出去散步是个好主意。;2．it 作形式宾语的用法 当不定式、动名词或从句在某个句子中作宾语时，为保持句子结构平衡，避免头重脚轻，常用it作形式宾语，而将真正的宾语放在句尾。it作形式宾语常用于以下几种情况：;用　法;用　法;用　法;用　法;Ⅰ.完成句子 1．这对夫妻分手已经有十年了。 ______________since the couple broke up.(be) 答案：It is/has been ten years 2．他是2000年12月22日一点钟出生的。 It was one o’clock on 22nd，Dec.2000________.(bear) 答案：when he was born;3．过了十年他们才走出事故的阴影。 ________before they came out of the accident.(take) 答案：It took ten years 4．那是他第三次去北京。 It was the third time that________Beijing.(go) 答案：he had gone to 5．在上次讲座中，这位科学家发现将这一理论向那些有背景知识的人讲解要更加容易些。 During his last lecture，the scientist________explain the theory to those with some background knowledge.(find) 答案：found it (was) easier to; 6．放心，他不会做出有害于我们之间友谊的事情。 You can________he will never do anything that is harmful to our friendship.(depend) 答案：depend on it that 7．关于那件事再多说是无用的。 It is no use________about it.(say) 答案：saying any more;8．据报道，有两人在事故中受伤了。 ____________________two people were injured in the accident.(report) 答案：It is reported that 9．我很讨厌你在公众场合说这种事。 I________you say such things in public.(hate) 答案：hate it when 10．帮你提高你的英语是我的职责。 It is my duty____________your English.(help) 答案：to help you improve;Ⅱ.单项填空 1．Has______been decided when we are to hold the sports meeting? A．that　　　 B．this　　　　C．it　　　 D．what 解析：考查it的用法。句意：我们什么时候开运动会已经决定了吗？it在句中作形式主语，代替真正的主语when we are to hold the sports meeting。其他选项都不能