It is 可用于强调句、定语从句、主语从句等多种句型，举例如下： It is(was)that句型,It is+被强调成分+that+句子剩余部分（强调句）： 可以分别用来强调主语、宾语、地点状语和时间状语。如： It was he who(that)read three books in the library yesterday.(强调主语) 是他昨天在图书馆读了三本书。 It was in the library that he read three books yesterday.(强调地点状语) 他昨天是在图书馆里读了三本书。 It is+名词+定语从句： It was the day my grandmother was angry. 那一天我外婆生气了。 It is +名词/形容词+不定式主语： It做形式主语，句子真正的主语是不定式。 It was a pleasure to draw pictures. 画画是一种享受。 上一篇：初中1000米成绩标准 下一篇：tea是可数还是不可数 |