核心问题
Seeing everyone is here, we may as well get into the train.
seeing 是分词吗?
词典解答
seeing 是复合连词 seeing that 的省略形式, 其含义相当于 as, since, now (that), 但是, seeing that (鉴于, 由于) 一般用于正式语体:
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Seeing that it seems as if it will rain soon, we had better leave now. 好像过一会儿就要下雨，我们最好现在就走。
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Seeing (that) she's lawfully old enough to get married, I don't see how you can stop her. (LDCE) 她已到合法的结婚年龄，我不明白你怎么能阻止她。