they often play football on the playground,.thethey often play football on the playground,.they是复数,为什么play后面没有s

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they often play football on the playground,.thethey often play football on the playground,.they是复数,为什么play后面没有s
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they often play football on the playground,.thethey often play football on the playground,.they是复数,为什么play后面没有s
they often play football on the playground,.the
they often play football on the playground,.
they是复数,为什么play后面没有s

they often play football on the playground,.thethey often play football on the playground,.they是复数,为什么play后面没有s
often 后面加动词原型