英语人教版选修6Unit3 A healthy life SectionⅡ_参考答案
Unit 3 A healthy life Section Ⅱ Grammar语法指南it的用法(1)一、it作人称代词1.it的最基本用法是作代词,主要指刚提到的事物,以避免重复。Xi'an is a beautiful city,isn't it?西安是个漂亮的城市,是吗?They watched the train until it disappeared in the distance.他们看着火车,直到它消失在远处。2.也可以指动物或婴儿(未知性别的婴儿或孩子)。—Is this your dog?—No,it isn't.——这是你的狗吗?——不,它不是。二、it作非人称代词it有时并不指具体的东西,而泛指天气、时间、日期、距离、价值、度量、温度、环境等,称为非人称代词it。1.指天气:It is a lovely day today,isn't it?今天天气不错,是吗?2.指时间:It was nearly midnight when she came back from work.她下班回来将近半夜了。3.指环境:It was very quiet in the waiting room.候诊室里非常安静。4.指距离:It is half an hour's walk to the city centre from my home.从我家到市中心步行需要半小时。5.指日期:It's November 1,2011 today.今天是2011年11月1日。6.指季节:It was autumn when we met for the first time.我们初次见面是在秋天。7.指度量:It is about 3 kilograms.大约三公斤。8.指价值:—What's the cost of your new watch?你的新手表多少钱?—It is 150 yuan.150元。三、it用作形式主语替代作主语的从句、动词不定式、动词-ing形式,而把真正作主语的从句、动词不定式、动词-ing形式置于句尾。1.替代作主语的动词不定式,其句型为:完整答案请下载附件
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