改写句子的常考题型:
4、 It引导的形式主语句子与其他句型的转换
「例句」
5.He spent 4 hours in doing his homework yesterday.
It took him 4 hours his homework yesterday.
6.It seems that they like pop music.
They to like pop music.
「正确答案」5.to do6.seem
「规律分析」这部分要求了解代词it在句子中的各种用法。it在英语中是个相当活跃的代词，它可以作形式主语、形式宾语和引导强调句等。
5、 一些习惯用法的不同表示法
「例句」
7.They have studied English for 20 years.
They began to study English .
8.He went to the class at 9 o“clock.
He didn“t go to the class 9 o”clock.
「正确答案」7.20 years ago8.until
