she has to clean all the furniture in all the bedrooms in two hours

问题描述:

she has to clean all the furniture in all the bedrooms in two hours
这句话当中的furniture和bedrooms 为什么一个要加s一个不用加s的?
The young students like dickens' and Mark Twain's novels very much
这句话当中的人名dickens'和Mark Twain's 的s用法为什么不一样的?
I have a lot of work to do
为什么要用a lot of 用many work 不行吗?还有就是那个work后面不能加s的?

furniture不可数名词,bedroom是可数名词,有复数形式.
小说分别是dickens的和Mark Twain的,所以A's and B's
Lucy and Lily's mother (Lucy 和Lily是姐妹)在这里Lucy 和Lily 的妈妈是一个,所以A and B’s,看出区别所在了吗
many只修饰可数名词,work 是不可数名词.在这里可以用much work,a lot of 可以修饰可数和不可数名词