文档介绍：it作形式主语?it作形式主语:it作形式主语时没有具体的意义,而只是帮助把真正的主语移到句子后部去,使句子显得平稳一些。it作形式主语时,可以代替三种形式:不定式、动名词和主语从句。?it代替不定式短语常用于下列句型中:It+be+形容词+(for/ofsb.)+be+名词+…花了某人…时间It’…是某人的职责或义务?Itiseveryone’。(it作形式主语,代替不定式短语toobeythelaw)?,学****汉语是困难的。(it作形式主语,代替不定式短语tolearnChinese)?。(it作形式主语,代替不定式短语tousetheseplacesasrubbishdumps)?。(it作形式主语,代替不定式短语tobuildthebridge)?Itbe+形容词++形容词+.:、品格,,,否则就用for。?It’snecessaryforustouseashort-。?It’。(=Youarekindtohelpme.)?。(=Hewasfoolishtogiveupthejob?it代替动名词短语:动名词作主语用后置形式的情况远不及不定式那么普遍,常限于nogood,nouse,useless,waste等词的后面。?Itisnogood/usehavingacarifyoucan’,有车也没用。(it作形式主语,代替动名词短语havingacar)?。(it作形式主语,代替动名词短语watchingTV)?。(it作形式主语,代替动名词短语askinghim)?it代替主语从句:这个主语从句可以用连词that引导,也可以用连接代词或连接副词引导。?。(it作形式主语,代替主语从句thattheyhadnodesireforpeace)?。(it作形式主语,e)?。(it作形式主语,代替主语从句whatshemeant)用it作形式主语,把真正的主语从句移至后面的常见句型有:?Itisapity/ashame/afact/anhonour/goodnews/nowonder/awonder…that…?Itwasapitythattheengineercouldn’。?Itisawonderthathecontinuestogamblewhenhealwaysloses!令人惊讶的是他一直输还一直赌。?Itis+形容词(如:strange/natural/surprising/obvious/true/fortunate/wonderful/funny/possible/impossible/likely/unlikely/clear/unusual/certain/important…)that…?。。?Itseems/happened/turnedout/suddenlystruckme/occurredtome…that…?IthappenedthatIwasn’。?It+be+过去分词(如:said/reported/announced/decided/expected/hoped/known/believed…)that…?Itissaidthatnothinghasbeendo