He _____(run after ……quickly) the thief but he couldn't catch him .解释句意并说明理由

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He_____(runafter……quickly)thethiefbuthecouldn''tcatchhim.解释句意并说明理由He_____(runafter……quickly)thethiefb

He _____(run after ……quickly) the thief but he couldn't catch him .解释句意并说明理由
He _____(run after ……quickly) the thief but he couldn't catch him .解释句意并说明理由

He _____(run after ……quickly) the thief but he couldn't catch him .解释句意并说明理由
He quickly ran after the thief but he couldn't catch him.
but连接并列成分.he couldn't 是can't的过去式形式所以前边也用过去式ran.

has run after
他已经跑得很快地去追捕那个小偷了,但是最后还是没捉到小偷。
解释:现在完成时可以表示过去做的对现在的影响

ran after
他快跑去追那个小偷了,但是最后还是没捉到他。
解释:一般过去时可以表示过去发生的动作