sb was doing sth
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sb was doing sth
![sb was doing sth](/uploads/image/z/194412-12-2.jpg?t=sb+was+doing+sth)
he was playing in the street 中的 in the street是介词短语,可以省略;省略后变成he was playing ,这是过去进行时,表示过去正在发生的事,而he is playing 是现在进行时,表示现在正在发生的事.
至于sb was doing sth 是否成立,你体会一下下面的句子:
he was playing in the street.他在街上玩.
he was playing basketball in the street.他在街上玩篮球.
至于sb was doing sth 是否成立,你体会一下下面的句子:
he was playing in the street.他在街上玩.
he was playing basketball in the street.他在街上玩篮球.