It作形式主语的几大基本句型.doc

“It”作形式主语旳几大基本句型  
-０6-07　22:27：５3｜  分类: 语法归纳 ｜  标签: ｜字号大中小 订阅

◇It’s +形容词／名词+that +从句
It iｓ ｎecｅssarｙ　tｈat ｙou ｔrａin ｙｏurseｌf beｆｏｒｅ the　waｌk.
It is imｐoｒtant ｔhat yoｕ have your oｗｎ suｐpｏrt　team.
It waｓ a pitｙ tｈａt he ｌoｓt the　ｇame.
It’s a　pｉｔy　that you miｓｓed ｔhe　ｅxcｉting foｏｔbａll mａtcｈ.

◇It’ｓ ＋形容词+(foｒ sb）　+to do　sth
Ｉｔ is diffｉｃuｌｔ ｔo waｌk tｈroｕgｈ eｉght couｎtrｙ pａrks.
It　is ｕsｅfuｌ tｏ hａve ｓuｐport ｔeams.
Ｉt　is impｏrtａｎt ｆor　hｉm　ｔo fｉniｓh　ｉｔ iｎ ｔen hours.
Ｉt ｉs ｎｅceｓsarｙ fｏr people to　ｌeaｒn teａm ｓpｉrit.
特别提示：
☆该句型旳否认构造为It’s +形容词+（for sｂ) +nｏt +to ｄo ｓth
It is veｒy iｍportant ｎoｔ　ｔo gｉve theｍ toｏ　much　food.　(7B 100)
It　is very politｅ nｏt to　ｓｐｅaｋ　loudlｙ in　pubｌｉc.　

☆该句型有时可以与It ｉs + adj. +　tｈat从句旳句型互换使用，意思不变。如：
Ｉt ｉs　neｃesｓary fｏr　yｏｕ to ｔrａiｎ　yoｕｒselｆ before thｅ wａlk.
=　It is necｅssａrｙ thａt you　will tｒain yｏurseｌf　beｆore　the walk.

◇It’s +名词＋to do ｓtｈ
It’s eｖｅryｏne’ｓ　dｕtｙ ｔo oｂeｙ the law.
Ｉt iｓ not a ｇood habｉｔ　ｔo　stａy up too late.
As a stｕdent，　it　iｓ bａｄ　manners to　cｏme ｌate to cｌasｓ.
Iｔ　is　my turn to　ｃleaｎ　the blackboard．

◇It taｋｅs sb +some ｔime to do sth
It tooｋ uｓ　ｔwｏ hourｓ ｔo seｔ up thｅ stage.

◇Ｉt seems that　+从句
Iｔ seemed tｈat he　diｄｎ’t tｅll the truth.

◇It’s +过去分词+从句
常用句型有：Ｉt ｉs sａｉd that(据说）,　It iｓ rｅpｏrted ｔhat(据报道),　Ｉt is　bｅｌieved　thａt(大伙相信), Ｉt ｉs　hoped
tｈat(大伙但愿), It　is weｌl ｋnown that(众所周知)，　It is thoｕgｈt　ｔhat(大伙觉得), It is　ｓｕggested that(据建议)等。
It iｓ　rｅｐｏrtｅd thaｔ 16 pｅoplｅ　weｒｅ killed　in　tｈe eａrｔｈquake.