My sister often clean rooms to help my parents on Sundays .为什么clean不加s

来源：学生作业帮助网编辑：作业帮时间：2024/05/30 05:28:54

你好,这道题的正确答案是：
你说得对,这是一个错句.
因为主语是My sister,为第三人称单数,
on Sundays,在周日,所以时态为一般现在时
因此clean应该加上s
这句话翻译为：
我姐姐经常在周日帮我父母打扫房间.

本句时态为一般现在时，当主语为单数第三人称时，谓语动词需加s, 此为语法规则。

正确表达应该加s, 即用第三人称单数cleans才符合表达。

总觉得应该是my sister often helps my parents to clean rooms on sundays

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