Unit4Period3课件新人教选修6.ppt

;I. 代词 it a. 用作人称代词, 代替前文提到的事物。 My watch is missing. I can’t find (it) anywhere． Her father has gone abroad. Have you heard about (it)? ;b. 代替指示代词this, that。 What’s this? (It’s) a computer． Whose pen is that? It’s mine． c. 表示时间、天气、距离、季节、明暗等。 It’s time for lunch. It’s getting warmer and warmer．;It’s forty years since my hometown was liberated． It’s summer now． How far is it from here to the airport？ It’s about twenty minutes’ walk from here to the bus stop．;II. 引导词： a. 作形式主语, 代替由不定式, 动名词或从句表示的真正主语。其基本句型为： It (形式主语) +adj. + to+ v. It (形式主语) +adj. + that (subject (主语)+v. ) ;It (形式主语)+adj.+ whether (subject +v.) It is ＋adj.＋for／sb. to do sth. (of ) It＋seems (appears)＋that (subject ＋v.) happens ;① It is very important to help each other． ② It is no use / useless going there again． ③ It’s not decided yet when they will leave for Shanghai． ④ It seems that he has caught a cold. =He seems to have caught a cold．; ⑤ Is ____?possible to master a foreign language in two months? A. now??B. that?? C. it? D. man ⑥ Is ____?necessary to tell his father the truth? A. it? B. that???C. what? D. he;b. 作形式宾语, 代替由不定式、动名词或从句表示的真正宾语。其主要基本句型为: 主语＋谓语＋it (形式宾语)＋宾语补足语＋to do sth. (doing sth. 或that从句).;① Marx found it important to study the situation in Russia． ② She thought it no use to write to him again． ③ They want to make it clear to the public that they do an important and necessary job． ;④ Do you think ___? difficult to work out this maths problem? A. that? ?B. very? ? C. yourself? D. it ⑤ Having been there many times, ___to find Mr. Wang’s house. A. it was easy for him B. for him it was easy C. he found it easy D. he found easy ;c. 用在强调句型中, 为了强调句子的某一成分(通常是主语、宾语或状语), 常用结构: It is / was ＋被强调部分＋that (who) ….