问题描述：
英语的状语从句,什么时候用现在分词,什么时候用过去分词?
例如以下两句：glancing at the bites of wood,he felt verysad；Armed with a torch he went up into the tower.请回答具体些
例如以下两句：glancing at the bites of wood,he felt verysad；Armed with a torch he went up into the tower.请回答具体些
问题解答：
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