修饰名词或代词的从句是定语从句 He who does not reach the Great Wall is not a true man. We are all looking forward to the day when 2008 Olympic Games begin in Beijing.
修饰一个句子的从句是状语从句 When he was walking in the street yesterday, he met with a friend of his.
在句中作主语的从句叫主语从句, That he came home late at night worried his parents.
在句中作宾语的从句叫宾语从句, I don't know why he came home late at night.
在句中作表语的从句叫表语从句, It looks as if it is going to rain.
在句中作同位语的从句叫同位语从句 I have no idea why he came home late at night.