sb was doing sth

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sb was doing sth
sb was doing sth

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.

sb was doing sth sb was doing sth at some的意思 help sb doing sth sb doing sth是什么意思? stop sb doing sth suggest sb doing sth sb spend + doing sth sb was doing sth when sth +动词过去式是什么时态急啊拜托了啊 sb was doing sth when sth 再造个句子 3Q warn sb.against (doing)sth. 英语中 sb.sth doing there be sb/sth doing sb.make me doing sth. force sb.into doing sth. keep sb doing sth例句是不是help sb doing sth for sb doing sth是什么意思? hear sb doing sth 造句