Collecting coins (cost\costs?)time and money because old coi

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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?

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?

Collecting coins (cost\costs?)time and money because old coi 在Collecting coins ------(cost) time and money中应该用单数还是复数啊?为什么 cost的用法1）cost既然不能加time,那么 sth costs sb time and money就是错的咯?2 The old man q____ likes collecting coins. To collect stamps_____much time and money. A.spends B.costs 改为同义句My hobby is collecting old coins 是sth cost sb money 还是sth costs sb money Both Lily and Lucy like collecting coins.(改为同义句) what do you like doing in your free time 是collecting coins 还 He usually spends much of his spare time collecting coins an collecting coins的中文意思 U like collecting coins very