“I ”的复数是“We”,“We”是我们的意思,是第一人称的复数形式。代词一定要和先前词搭配,因此,如果先前词是男性,代词一定是男性;如果先前词是复数,代词必定是复数。例句: 正确的: When Maria bought the detergent, she used her credit card. 不正确的: When Maria bought the detergent, they used his credit card.主格: I, you, he, she, it, we, they, who代词的主格是一个句子的主语。