They are doing some exercise with Mr Ma 为什么用doing

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TheyaredoingsomeexercisewithMrMa为什么用doingTheyaredoingsomeexercisewithMrMa为什么用doingTheyaredoingsomeex

They are doing some exercise with Mr Ma 为什么用doing
They are doing some exercise with Mr Ma 为什么用doing

They are doing some exercise with Mr Ma 为什么用doing
现在进行时be 动词+ing动词

因为是现在进行时 be+V-ing.

现在进行时,表示事情正在进行中。。。