问题描述：
Do they 和Are they在开头用法的区分
----they often ----(play)football at this time of day?yes,they----.问填Do 和play对还是are和playing对?Do they 和Are they在这里开头用法的区分,和什么时候该用Do they,什么时候用Are they,还有我说的这两个答案是不是都可以填?
----they often ----(play)football at this time of day?yes,they----.问填Do 和play对还是are和playing对?Do they 和Are they在这里开头用法的区分,和什么时候该用Do they,什么时候用Are they,还有我说的这两个答案是不是都可以填?
问题解答：
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