Is the expression "as well" mostly used in informal occasions? Longman dictionary claims so. However, I think it's also used in formal prose. (http://www.ldoceonline.com/dictionary/as-well)
For what it's worth, I certainly don't see it as mostly informal. What do you think?
Anonymous I certainly don't see it as mostly informal. Nor do I.
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Anonymous I certainly don't see it as mostly informal.
Nor do I.