"we both are" is a correct and usable phrase in written English. It can be used to denote a shared state or activity between two people. …
前后都是可以的.如:Both are my favorites.We are both going to the park.但用法是不一样的.下面是一段材料:both的用法：代词both的含义是"两个 …
Short answer: here, yes. It modifies "are." But it's not commonly thought of as an adverb. It's a very close call, and native speakers …
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