we rent a beach house with two small rooms,the smaller of which CAN serve as a kitchen这里CAN为什么不用COULD

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werentabeachhousewithtwosmallrooms,thesmallerofwhichCANserveasakitchen这里CAN为什么不用COULDwerentabeachhou

we rent a beach house with two small rooms,the smaller of which CAN serve as a kitchen这里CAN为什么不用COULD
we rent a beach house with two small rooms,the smaller of which CAN serve as a kitchen
这里CAN为什么不用COULD

we rent a beach house with two small rooms,the smaller of which CAN serve as a kitchen这里CAN为什么不用COULD
can表示泛指的,客观的可能性,并不涉及具体某事是否会发生,此种用法常常可表经验之谈,说明人和事物的特征
could只是在问句中表更委婉语气或在肯定句中表怀疑语气

因为could是委婉语气

1.时态的不同。could 为can的过去式,因而在句子中,应根据时态进行选词。
2. 除了时态,could也可用作现在时中,表示比较婉转的说法,比如:could you please pass me the book?

could是can的过去式,也可用于不确定的句子,相当于“可能”
本句似乎是现在一般时,而后一句是可以用作厨房之意,不是可能用作厨房,这解释不通。