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语法精讲The Use of “It” (1) as Subject“It”的用法(1)作主语 1.it用作人称代词，指前面提到过的人或物。 The frog is not a warmblooded animal.It is a coldblooded one. 青蛙不是温血动物，而是冷血动物。(指代the frog) —Who is knocking at the door? 谁在敲门？ —It is me. 是我。(指代人) —What is this? 那是什么？ —It is a flag.It is hers. 是一面旗，那是她的。(指代this或that) 2.it也可用作非人称代词，表示天气、日期、时间、温度、距离、环境情况等。 It was very noisy at the moment. 现在外面很吵。(指环境情况) —What time is it? 几点了？ —It is eight o’clock. 8点了(指时间) It is five kilometers from the office to my home. 从办公室到我家5千米。(指距离) 3.it常用作形式主语或形式宾语，而把真正的主语或宾语(不定式、动词ing形式或名词性从句)置于句尾，以满足句子的需要。 it作形式主语，常用于下列结构： | 
