2012年公共英语四级考试写作指导教程02

　　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。
　　一些习惯用法的不同表示法
　　第四章写作全国英语等级考试教程(第一级)【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
　　【规律分析】这部分要求掌握英语中一些习惯用法的表达方式。在改写句子时，要求用不同的句型或不同的词表达出相同的意思。