watch 是感官动词,后跟动名词,或动词原形,所以:watch sb.do sth./ watch sb.doing sth.
这是个一般过去时的句子,时态体现在 watched上,而leave是由watch决定的,既:watch sb.do sth.,所以不用leaves
中文意思:我看着火车离开车站
过去式的动词三单We watched the train leave(为什么不用leaves?) the station
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为什么要用does?When does the train leave the station?
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could you tell me when the train leaves?这里为什么不用will leave,为什