the flowers which she bought is beautiful.这个句子是一个什么句子?定语从句?主语从句?同位语从句?我们一直在纠结这个问题,谁能给我详细回答这个问题.

the flowers which she bought are beautiful是一个定语从句，which引导定语从句，修饰先行词flowers。意为：她买的那些花很美丽。

定语从句

纠正：这句话正确的为the flowers which she bought ARE beautiful
语病：因为句子的主语是 The flowers,是一个复数，所以后面的动词应该用 are，而不是is.

主语从句
就是从句的位置是一句话中的主语

是含有定语从句的复合句.which she bought is beautiful是定语从句修饰
the flowers.which 在从句中作"bought"的宾语
同位语从句是对前面的名词作补充说明,不起修饰作用
that 引导同位语从句时,that 不充当成分
但是that 引导定语从句时,that 在从句中充当主语或宾语.
比如:这个句子The flowers which she bought is beautiful.可把which换成that
但:The news that our team win the game is exciting.这个句子中 that our team win the game 是同位语从句,说明news 的具体内容,that 从句中不充当成分.
which 引导同位语从句的话,which 是哪一个的意思.
例:I don't care the problem which team will win the game.
which team will win the game是同位语从句.说明 problem 的具体内容.
主语从句:是指作主语的句子.
例:That our team has won the game is exciting.
or:It's exciting that our team has won the game.(it是形式主语)
That our team has won the game 是主语从句.谓语是is
不再纠结了.