Unit_3_A_healthy_life_Ⅳ__Grammar__Writing_课件(人教选修6).ppt

Section Ⅳ;it的用法(Ⅰ);一、it用作代词 1．it作非人称代词，常用于指代时间、距离、自然现象、 量度、价值等。 It’s time to get up.(指时间) 到起床的时间了。 It’s going to snow.(指天气) (天)要下雪了。 It is a long way from my school to the hospital.(指距离) 从我的学校到医院(距离)很远。;2．it用作人称代词，代替前文提到的事物、性别不明或被 认为不重要的人或动物，未指明但谈话双方都明白的事情或情况。 — Who is knocking at the door? 谁在敲门？ —It’s me. 是我。(性别不明) We bought a new house but it will need a lot of work before we can move in.(代替前文提到的事物) 我们买了一所新房子但搬进去之前还需要很多工作。;1－1(2011·北京高考)The employment rate has continued to rise in big cities thanks to the efforts of the local governments to increase________. A．them　　　　　　　　 B．those C．it D．that 解析：选 。考查代词。根据句意“由于地方政府的努力，大城市的就业率在上升。” 可知应用it 指代the employment rate。;1－2(2009·北京高考)Being a parent is not always easy, and being the parent of a child with special needs often carries with________extra stress. A．it　　　　　　　　 B．them C．one D．him 解析：选 。考查代词的用法。句意：当一名父亲或母亲并不总是容易的，当一名有特殊需要的孩子的父亲或母亲经常还要承受额外的压力。此处的it指代的是前面提到的“Being a parent is not always easy，”这种情况。;3．用来代替指示代词this, that。 — Is this your new computer? 这是你的新电脑吗？ — No, it isn’t. 不是。 — What’s that? 那是什么？ — It’s Tom’s passport. 是汤姆的护照。;二、it作形式主语 it常可代替不定式(短语)、动名词(短语)或从句等作形 式主语，而将真正的主语移至句子后面。 it作形式主语的几种常见句型： 1．It is＋形容词(good/kind/clever/stupid/easy/hard/ difficult/important，etc.)(＋of/for sb.)＋to do sth. It’s important for us to learn English well. 学好英语对我们来说很重要。;2．It is＋形容词(important/necessary/clear/possible/natural /strange, etc.)＋that＋sb.＋(should) do sth.(虚拟语气) 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。 3．It is no use/good /useless/senseless/dangerous/enjoyable/ worthwhile/a waste/fun, etc.＋doing sth. It’s no use crying over the spilt milk. 覆水难收。;4．It is said /reported/announced /(well-)known/believed /hoped/suggested/expected, etc. that ... It is reported that 22 people were killed in the grassland fire in Sichuan Province. 据报道在四川省火灾中有22人丧生。 5．It is ＋名词(词组)(a pity/a shame/an honor/ no wonder/a fact, etc.)＋that从句。 It’s a pity that you missed such an ex