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

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

Collecting coins (cost\costs?)time and money because old coins are very hard to get.选COST为什么不加S呢?
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 是主语,cost的后面也要加s?

应该加S的

应该选costs啊，因为是短语作主语的啊，collecting coins 是一个短语啊，算是第三人称的，当然要用单数costs啦

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