He often plays computer games.中的play为什么加S？
He often plays computer games.中的play为什么加S？
He often plays computer games.剧中的"often"是一般现在时的标志，oftenusuallyalways等词后的动词需要加s吗？是不是只有单数第三人称才加s？
He often plays computer games.剧中的"often"是一般现在时的标志，oftenusuallyalways等词后的动词需要加s吗？是不是只有单数第三人称才加s？
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