they are是动词to be的第三人称复数形式。
它总是使用动词第三人称单数的形式，尽管在英语中它的动词总是复数。
It always takes the third person singular form of the verb even though it's always plural in English.
它总是使用动词第三人称单数的形式，尽管在英语中“我们”的动词总是复数。
It always take the third person singular form of the verb even though it's always plural in English.
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