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高中英语：unit4grammar课件新人教版教材必修3课件.ppt

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主语从句Whowillwinthematchisstillunknown. Iwanttoknowwhathehastoldyou. Thefactisthatwehavelostthegame. Thenewsthatwewonthegameisexciting.NounClauses (名词性从句)Isthemoonaplanet?Thisquestionis______________ifstudentsaretoshowthattheyunderstandthenatureof__________.Somescientiststhinkthattheearth______________themoonbecausethemooncirclesourplanet.Othersbelievethatthemoon_______beforetheearthwasformed.Theythinkthatearlierintimeittravelledthroughspaceasasmallplanetwhichwascaughtbytheearth’sgravity.__________,itgoesaroundourplanet.Theevidenceforthistheoryisthatthe_____thatmakeuptherocksonthemoonseemtobedifferentfromthoseonearth.Whatisclearisthatthemoonissmallerthantheearthandthis_________it_______escapingfromtheearth.Althoughitsoriginmaystillbea________,themooncanneverbeanythingmorethanasatelliteoftheearth.Isthemoonaplanet?Thisquestionis______________ifstudentsaretoshowthattheyunderstandthenatureof__________.Somescientiststhinkthattheearth______________themoonbecausethemooncirclesourplanet.Othersbelievethatthemoon_______beforetheearthwasformed.Theythinkthatearlierintimeittravelledthroughspaceasasmallplanetwhichwascaughtbytheearth’sgravity.__________,itgoesaroundourplanet.Theevidenceforthistheoryisthatthe_____thatmakeuptherocksonthemoonseemtobedifferentfromthoseonearth.Whatisclearisthatthemoonissmallerthantheearthandthis_________it_______escapingfromtheearth.Althoughitsoriginmaystillbea________,themooncanneverbeanythingmorethanasatelliteoftheearth.主语从句： 做主语用的名词性从句，因其在复合句中做主语，又称主语从句，引导主语从句的有连词that，whether，连接代词who，what，which，连接副词when，where，how，why等。 1）从属连词：that，whether等. that引导主语从句只起引导作用，本身无实际意义，在主语从句中不充当任何成分，但不能省略。 .注意:由that引导的主语从句有时为了使句子结构平衡,避免“头重脚轻”,常用it作形式主语,而把从句放在后面。例如: 这样就构成了下面一些常用句型: 1)Itis+n.+从句 Itisapity/shamethat...遗憾的是…… Itisasurprisethat…令人惊奇的是… Itisafactthat……是事实 Itiscommonknowledgethat……是常识 *_______________(很遗憾)welostthematch. *______________(这是事实)hecheatedintheexam.2)Itis+adj.+从句 It’scertainthat…肯定… Itispossiblethat...很可能…… Itisunlikelythat...不可能…… Itisobviou