定语从句与同位语从句最本质的区别就是,同位语从句是对主语的进一步诠释,定语从句是对先行词的修饰,定语从句的先行词几乎可以是任何名词,而同位语从句的主语只能是有内涵的词语
eg:I don't like the way you speak to her.这里的定从是对方式的修饰,我不喜欢这个方式,什么方式呢,你对她说话的方式.
同位语从句例句：We all cheer up when we heared the news that our team won the first prize.这里的同位语从句是对我们听到的这个新闻的诠释.
定从例句：I am eating the apple that my mother left.
This is the ball which is left by Tom.
It's my father who has saw the accident.(此句同样是强调句）
同位语：I have gotten the message that Tom had won the game.