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Hewassosurprisedatbeingdiscoveredthathedidnoteventrytorunaway1.beingdiscovered这是一般现在时的被动语态?2.为什么at后面be要加ing?

题目详情
He was so surprised at being discovered that he did not even try to run away
1.being discovered 这是一般现在时的被动语态?
2.为什么at 后面be要加ing?
▼优质解答
答案和解析
1,是一般被动语态
2,be 后加 ing 是因为 surprised at 后要加名词或者动名词,这是语法用法.和被动语态没关系.