The teacher's desks are big.还是用The teachers' desks are big.teacher's 的所有格应该用复数teachers'还是用单数呢?

The teacher's desks are big.还是用The teachers' desks are big.teacher's 的所有格应该用复数teachers'还是用单数呢?
The teacher's desks are big.还是用The teachers' desks are big.teacher's 的所有格应该用复数teachers'还是用单数呢?

The teacher's desks are big.还是用The teachers' desks are big.teacher's 的所有格应该用复数teachers'还是用单数呢?
teacher's是一个老师的所有格.teachers'是两个以上的所有个,因为以s结尾的名词只加'就可以.所以是teachers

以S结尾的复数名词的所有格，在后面加“’”！

这里teacher 用了复数，那所有格直接加'就可以了，语法书上关于所有格有这条

The teachers' desks are big.
teaacher有单复数的啊