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问题: friend在句子中是不是只有一种形式friends

例句:his friends is Tom

解答:

一个朋友就用单数,几个朋友就用复数.

要注意, 光用一个单数,可能就一个朋友, 正常的用one of his friends. 你的例子不是很好.

one of his friends is Tom.

That is his friend Tom.

Tom is his friend.