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Unit 4 Global warming 第四學時 Grammar,it的用法(Ⅱ),1．it 在強調(diào)句中的用法,it 可用來對句子謂語以外的某一成分進行強調(diào)，強調(diào)句的基本句型為：It＋動詞be＋被強調(diào)部分＋who(m)/that＋其他部分。被強調(diào)部分指人，引導詞用who/that均可，被強調(diào)部分是人，并且在句中作賓語時，可用whom/who/that引導。強調(diào)其他部分，一律用that。被強調(diào)的部分是原句的主語時，who/that之后的謂語動詞在人稱和數(shù)上與該主語一致。 (1)It was Jane who paid for the meal yesterday.(＝It was Jane and not another person.),昨天的飯錢是簡付的。 (2)It was the meal that Jane paid for yesterday.(＝It was a meal and not something else.) 簡昨天付的是飯錢。,2．強調(diào)結構和主語從句句型(It＋be＋adj./n.＋that其他部分)的區(qū)別 (1)強調(diào)結構可以翻譯成“正是……”或“就是……”。 (2)含有主語從句的句子刪掉It be.that/who，則原句在結構上和意義上均不成立，而強調(diào)結構若去掉結構標志后，原句在結構上和意義上仍然成立。 It is I that/who am your true friend. 我才是你真正的朋友。,(這是強調(diào)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門外語。 (It作形式主語，代替后面由that引導的主語從句，去掉It is.that后，句子不能成立。),3．強調(diào)句型和It＋動詞＋一段時間＋before/when/that/since句型的區(qū)別 (1)強調(diào)句型：It＋is/was＋被強調(diào)部分＋who(m)/that＋其他部分。 It was not until he came back that his mother went to bed. (2)It is＋時間段＋since 從句(一般過去時/過去完成時)。,Its years since we enjoyed ourselves so much. 我們已有好多年沒有這么開心過了。 (3)It was/will be＋時間段＋before 從句(一般過去時/一般現(xiàn)在時)。 It was not long before he joined the Party. 不久，他就入了黨。 (4)It was＋時間點＋when從句(一般過去時)。 It was 12 oclock when he came back to school.,(這不是強調(diào)句。it指時間， when引導時間狀語從句。) 比較：It was at 12 oclock that he came back to school. (這是強調(diào)句，強調(diào)時間狀語at 12 oclock，去掉It was.that，句子仍然成立。),4．對于特殊疑問句強調(diào)的句式是“疑問詞＋is/was＋it＋that＋其他部分” What is it that Rosa has found in the living room? 露莎在起居室里發(fā)現(xiàn)的是什么？ I dont know what it is that Jimmy has done in his study. 我不知道吉米在書房里干什么。,Do you still remember where it was that you first came across Paul three years ago? 你還記得三年前是在哪兒第一次見到保羅的嗎？,