Were you playing basketball just now?和Did you play basketbal

二者发生时间相同,但表示动作的状态不同.
Were you playing basketball just now?你刚刚是在打篮球吗?过去进行时,表示动作在过去正在进行；
Did you play basketball just now?你刚刚打篮球吗?一般过去时,表示动作在过去发生了.