Collecting coins (costcosts?)time and money because old coins are very hard to get.

题目

Collecting coins (costcosts?)time and money because old coins are very hard to get.
选COST为什么不加S呢?

答案

你好.作为谓语动词,cost后面必须加s,因为Collecting coins做主语是单数第三人称的概念.你的句子可以改写成：It costs time and money to collect coins because old coins are very hard to get.你看见了吗,it 是主...