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独立主格为什么用BEING,There being no bus,we had to walk home.There being no chance to win ,we had to give it up .为什么不用am is are was were?

题目详情
独立主格为什么用BEING,There being no bus,we had to walk home.
There being no chance to win ,we had to give it up .
为什么不用am is are was were?
▼优质解答
答案和解析
因为am is are was were是构成句子时的动词形式,而being是非谓语动词中的现在分词形式