常用it作形式主语的句型结构

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1、 常用it作形式主语的句型结构 It + be +形容词+ that-从句可用于此句型的形容词有: wonderful,true，good，right，wrong，（un）important，useless，surprising，clear，unusual，lucky，certain, necessary等。如： Itisquitecertainthat hewillbeatthemeeting. It is surprising that he came late to school this morning. Itisimportantthatwe(should)studyhard注意:

2、该句型中的形容词是（un）important, necessary等时，从句应为 (should )+动词原形。 It + be + -ed 分词+ that-从句 适用该句型的过去分词主要有: said,reported,announced,hoped,thought，told，believed，expected，decided，suggested,known等。如： Itishopedthatonedaytheywillhaveenoughanimalstosetthemfree It is well known that the earth goes around the sun. It

3、 is suggested that the sports meeting (should ) be put off until next week.注意: 该句型的过去分词是suggested时，从句应为 (should )+动词原形。 It + be +名词+ that-从句 适用该句型的名词（词组）有: apity，anhonor，agoodthing，afact，asurprise，goodnews, ones duty等。 如： Itisapity(that)youmissedthesportsmeetinglastweek. ItisafactthatEnglishisbeinga

4、cceptedasaninternationallanguage. Itseemappearhappen的适当形式that从句。该句型常可以转换成含不定式的简单句。如： Itseemsthatthereisabigwastepipecomingdownfromthetown.Thereseemstobeabigwastepipecomingdownfromthetown. Heappearedto becalm,butinsidehisheartwasbeatingwildlywithfear.Itappearedthathewascalm,butinsidehisheartwasbeatin

5、gwildlywithfear. Itdoesntmatter ( Its no wonder; It doesnt make much difference等)when/where/which/whether等从句。如： Doesit matterifhecantfinishthejobontime? Theyareallclassmates. It isnowonder theyshouldhelpeachotherwiththeirstudies. It+be+adj./n.(forsb./ofsb.)+todosth. 该句型中的形容词通常是表示事物的特点或特征的如difficult，

6、hard，easy，impossible，necessary，important等，此时用for；或表示人的性格特征或特点的如nice，good，bad，kind，silly，foolish，wise，clever，careless，rude，brave，cruel，careful，grateful等，这时要用of。如： It is foolish of you to give up such a good chance. It is necessary for college students to master at least a foreign language It作形式主语常见句型

7、动词不定式，动名词或主语从句作主语时，通常把它们放在谓语动词前，而用it作形式主语，放到句首，常见句型有：1. It + be + 形容词+主语从句，如：It is uncertain whether he can come to Jennys birthday party or not.2. It + be + 名词词组 + 主语从句，这类名词有：a fact, a pity, a shame, an honour，a question等，如：Its a pity that you missed the exciting football match.It remains a questio

8、n whether he will come or not.3. It + be + 过去分词 + 主语从句，这类过去分词有：announced, believed, expected, hoped, decided, reported, said, shown等， 如：It is reported that 16 people were killed in the earthquake.It is not decided who will give the operation to the patient.4. It + 不及物动词(seem, appear, happen等) + 主语从句

9、, 这类不及物动词有：appear, happen, seem等， 如：It seemed that he didnt tell the truth.It happened that I was out when he called.5. It + be + 形容词 + for sb.）+ 动词不定式这类句型常用形容词easy, difficult, hard, important, possible，wise等作表语，有时候为了强调不定式动作的执行者，常在不定式前加for sb，如：Its necessary for the young to master two foreign langu

10、age.It is unwise to give the children whatever they want.这类形容词有：easy, difficult, hard, important, possible，wise6. It + be + 形容词 + of sb. + 动词不定式，这类形容词常是表示心理品质,性格特征的形容词，如：kind, nice stupid, clever, foolish, polite, impolite, silly, selfish, considerate等。某人和这些形容词可以构成主系表结构。如：Its very kind of you to hel

11、p me with the work.=You are kind to help me.It seemed selfish of him not to share his dictionary with others.=He seemed selfish not to share his dictionary with others.7. It + be +名词词组 + 动词不定式，如：It is not a good habit to stay up too late.8. It + be + 名词或形容词 + 动名词，这类名词和形容词常常是：good, no good, no use, a