语法简单句并列句+复合句并列句名词性从句宾语从句表语从句主语从句同位语从句3种that通常可以省略动词+宾语从句介词+宾语从句含义结构系动词+从句that不做成分,但不能省略句子作表语,跟在系动词后面含义从句作主语(陈述语序)常见类型that/whether引导连接代词引导(what,who,whose,whom,which,whoever,whatever等)连接副词引导(when,where,why,how等)it作形式主语?Itisdone+主语从句Itisadj/n+主语从句连接词+陈述句that不能省略在抽象名词后,解释说明内容idea,opinion,,evidence,question,doubt,reason,theory,belief,possibility,chance,hope,contention,guarantee,fact...特殊句式Ifinditunbelieveablethatyouloveme.Theexecutivesaretalkingaboutwhethertheyshouldpasstheproposal.Partoftheproblemisthatmanyhomelessadultsareaddictedtoalcoholordrugs.Whenhewillcomeisunknown.Thatshesurvivedtheaccidentisamiracle.Whetherhewillcomeisunknown.Whoeverbreaksthelawshouldbepunished.Wherehewillgoisunknown.Itissaidthat...Itisbelievedthat...Itisnecessarythat...Itisapitythat...形容词性从句副词性从句主语过长,借It作形式主语Itmakeshimworriedthathishairisturninggray.Whathesaidistrue.Whichstudentwillwinisunknown.形容词+宾语从句Researchersadmit(v.)thattheirstudydoesnotanswerthequestion.it作形式宾语主语+谓语+it+宾补+that从句扩展:主语+谓语+it+宾补+todoIfindithardtofinishthehomework.Ifinditclearthatyouarewrong.Thejudgesaysshewillpassthebill.Timesarenotwhattheyusedtobe.含义一个句子做同位语(解释说明)However,theconventionalviewthateducationshouldbeoneoftheveryhighestprioritiesforpromotingrapideconomicdevelopmentinpoorcountriesiswrong.IgotaninformationthatXiaoZhanwouldcometoBeijing.Ihavegotamessagethathewon'tcometovisityou.必要的是......遗憾的是,.........,这......的是,...