it用处theuseofit英语语法.pptVIP

Unit 18 Grammar;用作人称代词;注 意;对 比 练 习;用作非人称代词;基本用法。当不定式、动名词、从句等用作主语时，为避免头重脚轻，通常在句首使用形式 主语it，而把真正的主语放在句子末尾： ⑴ Is it necessary to do so？ ⑵ I don’t think it is any good arguing with him. (3) It doesn’t matter what she says. 几种特殊的形式主语 1. 用作动词look 、seem 、appear 、happen 、occur 、follow 等的主语（后接that从句或as if从句）： ①It seems as if it is going to rain. ②It（so）happened that I had no money with me.;用作形式主语;用作形式主语;用作形式主语;用作形式主语;用作形式宾语;用作形式宾语;It for emphasis 强调句型复习;用于强调句型;I met Tom in the park yesterday.;① It was at the theatre _________ Lincoln was murdered. It was the theatre _________ Lincoln was murdered. A. which B. that C. where D. the one;④ It was ______ he said _____disappointed me. A. what; that B.that; that C. what; what D. that; what ⑤ It was for this reason ________ her uncle moved out of New York and settled down in a small village. A. which B. why C. that D. how ; 1. 句首词用“It”，不能用“This”，“That”等。2. be动词的形式是is或was，不能用复数形式are或were。 A. It___the Chinese women that___a great role in the socialist construction. A is;plays B are;play C is;play D are;playsB. __all these exercises____all of us can do tomorrow. A It is;that B It was;that  C They are;which D It will be;that;3. 连接词一般用that，当强调部分是人时，既可用that也可用who.特别注意当强调部分是时间状语或地点状语时，不能用when或where。 It was at the gate ________ he told me the news　　 A. that B.what C.which D.when ;It is Mary who often_____( help) me with my English. It is I that __________ (be)against you. It is the boy students of Class Two who _______ (be)playing football on the playground. It is Mr Green ,together with his wife and children ,that ____in China now. A are B is C was D were;1. He didn’t come because he was ill.;1. She didn’t go to bed until her father came back.;一般疑问句的强调;特殊疑问句的强调句型;It 句型辨析;高考真题精选;5. I should prefer___ if you didn’t go there alone. A. it