(完整word版)It做形式主语句型整理大全(2),推荐文档.doc
It作形式主语常见句型动词不定式,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 question 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, 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 language.It is unwise to give the children whatever they want.这类形容词有:easy, difficult, hard, important, possible,wise 6. 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 help 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 waste of, useless, senseless等,如:Its a waste of time talking to her any more.It is no use arguing about the matter with him.9. It + take ( sb. )+ 时间(金钱)+ 动词不定式,如:It took the workers almost three years to finish building the dam.It will take a whole day to get to the top of the mountain on foot.