表语从句 构成方式: 若从句为陈述句,直接加that; 若从句为特殊疑问句:直接保留特殊疑问词,后面的句子变成陈述句语序; 若从句为一般疑问句:先把一般疑问句变成陈述句语序,然后在其前加上weather或者if; eg:China is no longer what she used to be. The question is who is responsible for what has happened. (4)主语从句:主语变成一个句子 构成方式: 若从句为陈述句,直接加that; 若从句为特殊疑问句:直接保留特殊疑问词,后面的句子变成陈述句语序; 若从句为一般疑问句:先把一般疑问句变成陈述句语序,然后在其前加上whether或者if; 位置:直接置于句首; eg:That the college will take in more students is true. Whether he will come or not hasn't been decided. Why he isn't here is not clear to everyone. it 做形式主语的情况: (1)It is+名词+主语从句; eg:It is a pity that you should have to leave. (2)It is+形容词+主语从句; eg:It is clear that the whole project is due to failure. 如果是It is necessary/important/strange/natural+that引导的主语从句,从句中的谓语动词一定要用should+动词原形; eg:It is necessary that one should master the skills of operating computer. (3)It is+过去分词+主语从句;It is said/planted/expected… eg:It is said that President Bush will visit our school next week. (4)It is+不及物动词+形容词表语形式+主语从句; eg:It seemed certain that he will win the prize.