

一、作形式主語替代主語從句
觀察
1.It is quite certain that he will be at the meeting.
2.It is imprtant that we(shuld)think befre we decide.
3.It is a pity that yu missed the sprts meeting last week.
4.It is reprted that 16 peple were killed in the earthquake.
5.It is required that the students(shuld)learn a freign language.
6.It seems that they knw what they’re ding.
歸納 It替代主語從句作句子主語,主語從句后置。
常見的句型有:
(1)“It+be+形容詞+that從句.”可用于此句型的形容詞有 wnderful、true gd、right、wrng、Imprtant、surprising clear、certain、necessary等。需要注意的是,當(dāng)形容詞是imprtant、necessary等時(shí),從句要用1._______,謂語動(dòng)詞用shuld+動(dòng)詞原形”,shuld可以省略。
(2)“It+be+名詞(詞組)+that從句”適用該句型的名詞(詞組)有 a pity,an hnur、a gd thing,a fact、a surprise等。
(3)“It+be+過去分詞+that從句”適用該句型的過去分詞有 annunced、believed,expected、hped、decided、reprted、 said、shwn等。需要注意的是,當(dāng)過去分詞是 suggested、required、rdered等時(shí),從句要用2._______,謂語動(dòng)詞用“shuld
+動(dòng)詞原形”,shuld可以省略。
(4)還可用于“It seems/appears+that從句.”句型中。
二、作形式主語替代不定式短語
觀察
1.It is brave f the dctrs and nurses t save peple infected with the crnavirus.
2.It is imprtant (fr yu) t remember that Ebla desn’t respect natinal bundaries.
3.But it is vital(fr yu)nt t take any chances.
歸納 (1)It is kind(brave/flish/… sb.)t d sth.不定式的邏輯主語是由f引出的,句中的形容詞必須是能表示邏輯主語特征的褒義或貶義形容詞。
(2)It is necessary(imprtant/vital/…4.______ sb.)t d sth.不定式的邏輯主語是由fr引出的,句中的形容詞通常是表示重要性、緊迫性、頻繁程度等情況的形容詞。
三、作形式主語替代動(dòng)名詞短語
觀察
1.It is n gd/n use learning English withut speaking English.
2.It's useless trying t argue with Shylck.
3.It’s a waste f time talking t her any mre.
歸納 It作形式主語,可以替代后面的動(dòng)名詞短語。常用于“It+be+名詞或形容詞+動(dòng)名詞短語.”句式中,這類名詞和形容詞常常是gd、5._____、6._____、a waste f time、senseless、7、______等。
鏈接高考
單句語法填空
1.(2017江蘇,閱讀理解D,★★☆)When it cmes t adaptatin,it is imprtant
__________(understand)that climate change is a prcess.
2.(2017浙江,閱讀理解A,★★☆)While it’s likely ______ he understd very little f the bks they were his intrductin t classical paintings.
3.(2016課標(biāo)全國I,語法填空,★★☆)S It was a great hne ______ (invite) backstage at the nt-fr-prfit Panda Base where ticket mney helps pay fr research.
句型轉(zhuǎn)換
4.、(2020浙江1月,閱讀理解A改編,★★☆)That yu'd read every wrd in the bk and needed anther t start made n difference t her.
→_____ _____ _____ _____ t her that yu'd read every wrd in the bk and needed anther t start.
5.(★★★)It is reprted that a space statin will be built n the mn in years t cme. →A space statin _____ _____ _____ _____ _____ n the mn in years t cme.
6.(★★☆)It is said that bdy language accunts fr 55 per cent f a first impressin while what yu say just 7 per cent.
→ Bdy language _____ _____ _____ _____ _____ 55 per cent f a first impressin while what yu say just 7 per cent.
7.(★★★)Keep in mind that t waste fd is a shame
→ Keep in mind that _____ _____ _____ _____ _____ _____ _____.
8.(★★☆)Crying ver spilt milk is f n use.
→_____ _____ _____ _____ _____ ver spilt milk.
完成句子
9.(2018北京,閱讀理解D,★★☆)很難預(yù)測無人駕駛汽車什么時(shí)候會(huì)遍布我們的道路上的各個(gè)地方。
_____ _____ _____ _____ when driverless cars will be everywhere n ur rads.
10.(2018天津,8,★★☆)他花了很長時(shí)間掌握成為一名優(yōu)秀舞蹈家所需要的技能。
_____ _____ _____ _____ _____ _____ t acquire the skills he needed t becme a gd dancer.
答案:
1.虛擬語氣2.虛擬語氣3.f 4.fr 5.n gd
6.n use7. useless
1.t understand考查非謂語動(dòng)詞。句意:當(dāng)提到適應(yīng)時(shí),了解氣候變化是一個(gè)過程很重要。第二個(gè)it為形式主語,t understand..真正的主語。
2.that考查名詞性從句。句意:雖然他可能對這些書了解甚少,但它們是他對古典繪畫的初次接觸。it為形式主語,that引導(dǎo)的從句為真正的主語。由于從句結(jié)構(gòu)完整,句意完整,因此使用that。
3.t be invited考查非謂語動(dòng)詞。it為形式主語,t be invited..真正的主語。
4.It made n difference
5. is reprted t be built
6. is said t accunt fr
7.it is a shame t waste fd
8.It is n use crying
9.It's hard t predict
10.It tk him a lng time
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