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1、Unit 4 Global warming 第四学时 Grammar,it的用法(),1it 在强调句中的用法,it 可用来对句子谓语以外的某一成分进行强调,强调句的基本句型为:It动词be被强调部分who(m)/that其他部分。被强调部分指人,引导词用who/that均可,被强调部分是人,并且在句中作宾语时,可用whom/who/that引导。强调其他部分,一律用that。被强调的部分是原句的主语时,who/that之后的谓语动词在人称和数上与该主语一致。 (1)It was Jane who paid for the meal yesterday.(It was Jane and not
2、 another person.),昨天的饭钱是简付的。 (2)It was the meal that Jane paid for yesterday.(It was a meal and not something else.) 简昨天付的是饭钱。,2强调结构和主语从句句型(Itbeadj./n.that其他部分)的区别 (1)强调结构可以翻译成“正是”或“就是”。 (2)含有主语从句的句子删掉It be.that/who,则原句在结构上和意义上均不成立,而强调结构若去掉结构标志后,原句在结构上和意义上仍然成立。 It is I that/who am your true friend.
3、我才是你真正的朋友。,(这是强调句,去掉It is.that/who后,句子仍然成立。) It is necessary that you should master at least one foreign language. 你有必要掌握至少一门外语。 (It作形式主语,代替后面由that引导的主语从句,去掉It is.that后,句子不能成立。),3强调句型和It动词一段时间before/when/that/since句型的区别 (1)强调句型:Itis/was被强调部分who(m)/that其他部分。 It was not until he came back that his mot
4、her went to bed. (2)It is时间段since 从句(一般过去时/过去完成时)。,Its years since we enjoyed ourselves so much. 我们已有好多年没有这么开心过了。 (3)It was/will be时间段before 从句(一般过去时/一般现在时)。 It was not long before he joined the Party. 不久,他就入了党。 (4)It was时间点when从句(一般过去时)。 It was 12 oclock when he came back to school.,(这不是强调句。it指时间,
5、when引导时间状语从句。) 比较:It was at 12 oclock that he came back to school. (这是强调句,强调时间状语at 12 oclock,去掉It was.that,句子仍然成立。),4对于特殊疑问句强调的句式是“疑问词is/wasitthat其他部分” What is it that Rosa has found in the living room? 露莎在起居室里发现的是什么? I dont know what it is that Jimmy has done in his study. 我不知道吉米在书房里干什么。,Do you still remember where it was that you first came across Paul three years ago? 你还记得三年前是在哪儿第一次见到保罗的吗?,