They----(play)football every day.
问题描述：
They----(play)football every day.
答
play 他们每天都踢足球。所以是一般现在时。
答
直接原原形play,因为主语是They,又是every day,一般现在时。
They play football every day.
答
They play football every day.因为 every day是一般现在时,they是第三人称复数,后面动词用原形