Unit4　GlobalwarmingPeriod3课件人教版版选修六.ppt

Period 3　Grammar;it用于强调句式 “It is/was＋被强调部分＋that/who＋句子的其余部分”结构 ; 1．it结构概述 it用在强调结构中，为了强调句子的某一成分(通常为主语、宾语和状语)。 My mother met Tom in the street yesterday. →It was in the street that my mother met Tom. 我母亲就是在大街上遇到了汤姆。;2．it结构在句中的应用 (1)强调主语 It’s only I who am willing to go to the cinema. 想去看电影的只有我。 (2)强调宾语 It was her that I met yesterday. 我昨天见到的是她。 (3)强调状语 It was because her mother was ill that she didn’t go to work.是因为母亲病了她才没有去上班。; 3．it结构的否定句 It was not for several years that I had an opportunity of seeing him again.(＝I did not have an opportunity of seeing him again for several years.) 我有好几年没有机会再见到他了。 ; 4．it结构的疑问句 (1)这种强调句的一般疑问句只需把is/was提前。 Was it you that broke the window? 是你把窗户打破了吗？ Is it Professor Wang who teaches you English? 是王教授教你们英语吗？;(2)这种强调句的特殊疑问句，只需在一般疑问句前加上疑问词就可。 Who was it that broke the window? 打破窗子的是谁？ When was it that you called me yesterday? 你昨天是什么时候打电话给我的？ What is it that you want me to do? 你要我做的是什么？ How was it that you succeeded? 你是怎么成功的？; 5．有时可用It might be … that … ，It must have been … that … 句型表示强调 It might be his father that you’re thinking of. 你关心的可能是他父亲。 It must have been his brother that you saw. 你看到的想必是他的兄弟。 ; 6．在现代英语中，that/whom可省略 Was it in Nanjing(that) you first met him? 你是在南京第一次碰到他的吗？ It was my mother(whom) you saw the other day. 你几天前见到的是我妈妈。; 7．这一强调句型可用于原因状语从句，当原因状语从句是as，since引导时，应改为because引导，但结果状语从句、条件状语从句、让步状语从句等不能用于这一强调句型 She missed the first bus since she got up late. →It was because she got up late that she missed the first bus.她因起晚了而误了第一班车。; 8．使用这一强调句型时，需注意否定转移 Money can’t buy everything. →It is not everything that money can buy. 钱不能买到一切。 He didn’t go to bed until twelve o’clock last night. →It was not until twelve o’clock last night that he went to bed.昨晚他12点才去睡觉。; 9．用这一强调句型时，要注意以下几点 (1)不论强调句子的哪一部分，都可用that连接句子的其余部分。 (2)被强调部分指人时，可用who取代that。 (3)如果被强调部分指人，并且作后面句中的宾语时，也可用whom代替who。 (4)that，who等常常被省略掉，特别是在口语中，在强调直接宾语或间接宾语、时间或地点状语时。; (5)如果被强调的主语为人称代词时，可用主格，也可用宾格形式。 (6)被强调部分通常不能用不定代词，除非其后还有定语。 (7)如果被强调部分在后面的句子中有定语时，要用whose引导后面的句子。 (8)在强调