四级冲刺--动词不定式的用法荟萃答:当主语较长,谓语较短时,常用it做形式主语,而将不定式放到 谓语的后面。 【例如】 it is important for modern young people to master at least two foreign languages. it做形式主语,不定式放在谓语动词之后常用于下列结构中: a) it is+形容词(easy, important, difficult, foolish, inconvenient, unnecessary,...