英语语法：复合句　　复合句(Complex Sentence)分为并列复合句和从属复合句，并列复合句是有并列连词：and、or、but连接;从属复合句由一个主句(Principal Clause)和一个或一个以上的从句(Subordinate Clause)构成。
　　1、学生较容易混淆的是定语从句与同位语从句的区别。
　　例如：A、The　news that our team has won the match is true.
(同位语从句) 　　B、The news that he told us surprised everybody here.
(定语从句) 　　关键的区别在于连接或关系代词that：有意义的是定语， 无意义的是同位。
因为引导定语从句的that在从句中作主语或 宾语，而引导同位语从句的that只起到连接词的作用。
　　2、接着容易混淆的是引导定语从句的关系代词that与 which：that之前是不定(代词)、序数(词)、(形容词)较高遥：which之前是介词短语与逗号(非遥遥)。
　　例如：A、All that we have to do is to practise every day.
　　B、The first lesson that I learned will never be forgotten.
　　C、I have lost my pen，which I like very much.
　　D、The house in front of which there is a garden is my home.