I enjoy reciting the poems (written)by li bai,为什么不用were writ

这是一个定语从句.written在这里做定语.
还原成完整的句子应是：I enjoy reciting the poems (which were written)by li bai.
这里which were 可以省略.也就是说如果用were written要有which.
wrote是过去式,没有这种功能