句意：当他下火车的时候,外面恰好正在下雨
用不定式的进行时态,强调下火车的时候,雨正在下着,即之前已经开始下了且没有停.而若用不定式的一般时态,则只表示他刚下火车,才开始下雨,我想你可以把它放到语境中,更好理解.
When he got off the train,it happened----
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