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When arriving at that country, he found that there were few

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When arriving at that country, he found that there were few occasions to speak chinese.
句中arriving为何用进行时,后面found,were为什么用过去时?
这是一个省略句,非省略情况下应该是这样的 When he arrived at that country .但当主句和从句的是同一主语时,可以省略从句的主语,但是谓语得变形.主动就变成现在分词,被动就变成过去分词.