是I think everyone should have hobby.还是I think everyone should has a hobby.

题目

是I think everyone should have hobby.还是I think everyone should has a hobby.
我期末考试的作文上写的是I think everyone should has a hobby.因为我觉得everyone不是谓语动词要用三单的吗?但老师给我改成 I think everyone should have hobby.是不是老师改错了啊?
噢.不好意思,哪个have a hobby是我忘打了一个A,你们好细心.

答案

都不对!
should 是情态动词,后面必须接动词原形have. 这跟主语是否单三无关.
hobby 是可数名词,必须有单复数之分.因为主语everyone是单数,所以,hobby 前面应加a
I think everyone should have a hobby.
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