There is a set of keys.这句话没有错吧.

问题描述:

There is a set of keys.这句话没有错吧.
但是 a basket of apples
There is a basket of apples .难道也对吗。请回答我的补充问题。

This is a set of keys.也是这个道理.
如:this is a pair of shoes.