He said "My dog is very clever." She said "Mine (is), as well." Right. Use the comma. Otherwise, you're saying: "Mine (is) as well (as yours is)." And making a hash of it.
He said "What do you think, should we jump over the fence?" She said (we)Might as well." Also right.
I say "mine as well," but I think it's really "might as well." Is this true?
If this is an idiom, can it be added to the list?
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