一般来说,短暂性动作,也就是动作时间只持续一小段,我们使用过去时,比如你举得例子里的,land降落,在飞碟落地的那一刻,动作就结束了,不可持续.还有arrive到达,shout大喊；
而持续性动作,动作带有持续性,可持续很久,如：例子里的,sleep,我们使用过去进行时.
When the UFO(landed/was landing),the dog (slept/was sleeping
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