Today I've been doing some tasks and I've found one interesting thing as for me. So I'll explain what I mean.
Look at these sentences:
My friend is 19 years old.
So is mine.
where mine refers to my friend (another person).
And now I want you to look at this sentence:
My friends are 19 years old.
Should the response be "So are mine" or "So are mines"?
I know there is a verb "to mine"(like to dig) I know but I'm really confused with it.
If I understand it well, "Mine"(NOT A VERB) works as for singular (A friend) and plural (friends).