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1、会计学1It做形式主语做形式主语(zhy)讲解讲解第一页，共13页。Its necessary for the young to master two foreign language.Its a waste of time talking to her any more.Its a pity that you missed the exciting football match.动词动词(dngc)不定式不定式动名词动名词从从 句句形式(xngsh)主语第1页/共13页第二页，共13页。It 作为作为(zuwi)形式主语形式主语的用法的用法当当 不定式、动名词、从句不定式、动名词、从句 等用
2、作句等用作句子主语时，为保持句子平衡，通常把子主语时，为保持句子平衡，通常把真正真正(zhnzhng)的主语放在句末，而的主语放在句末，而在句首使用形式主语在句首使用形式主语it.第2页/共13页第三页，共13页。拒绝拒绝(jju)是令人遗憾的是令人遗憾的.记住这一点记住这一点(y din)是很重要是很重要的的.Its a pity to refuse.Its very improtant to remember this一、代替(dit)动词不定式做形式主语第3页/共13页第四页，共13页。It+be+adj.+（for sb.）to do sth.此处adj.通常为描述(mio sh)事件
3、的形容词：easy，difficult，hard，necessary，impossible，important，natural,likely，obvious，useful，useless，dangerous做某事是Its necessary for us to master a foreign language.第4页/共13页第五页，共13页。n nIt+be+adj.+of sb.to do sthn n 此处adj.通常(tngchng)为描述人的形容词：kind，nice，rude，cruel，careless，foolish，stupid，wise，crazy某人做某事，某人是n n
4、eg.Its foolish of you to drive a car after drinking.n n Its very kind of you to help me with my English.第5页/共13页第六页，共13页。It+be+名词词组(cz)+动词不定式eg.It is not a good habit to stay up too late.常见句型：It takes/took sb.some time/money to do sth.第6页/共13页第七页，共13页。It is no good crying over spilt milk.It is no us
5、e casting pearls before swine.覆水难收覆水难收(f shu nn shu)不要不要(byo)明珠暗投，对牛弹琴明珠暗投，对牛弹琴构成构成(guchng)如下结构：如下结构：It is+no use/no good/not any good/not any use+doing sth.二、代替动名词作形式主语第7页/共13页第八页，共13页。It+be+名词词组(cz)+主语从句这类名词有：a fact,a pity,a shame,an honour，a question，a surprise，common knowledgeeg.Its common knowl
6、edge that people cannt live without water.三、代替(dit)从句做形式主语It+不及物动词(j w dn c)+that（as if）-从句这类不及物动词(j w dn c)有：look，seem，appear，happen，occureg.It seems that he does not tell the truth.第8页/共13页第九页，共13页。n nIt is time+that sb.+v-ed/should don nEg.Its time that you went to bedn n Its time that you should
7、 go to bed.n nIts necessary/impossible/important/natural that sb.(should)do n nEg.Its important that we(should)keep the balance of nature.It+be+adj.+that-从句(cn j)第9页/共13页第十页，共13页。It+be+-ed（过去分词）+that-从句(cn j)It is said that 据说It is reported that 据报道It is supposed that 据推测It is hoped that 希望It is wel
8、l known that 众所周知(zhng su zhu zh)It is generally considered that普遍认为It is suggested that 有人建议第10页/共13页第十一页，共13页。练习(linx)：把下列格局转换为it做形式主语的句子1.He was rude to say so.2.Trying again is of use.3.When and where to hold the party hasnt been decided.It was rude of him to say so.It is of use trying again.It hasnt been decided when and where to hold the party.第11页/共13页第十二页，共13页。Thank you.第12页/共13页第十三页，共13页。