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I understand that the correct usage of also is with a verb:
She was smart, she also studied so much.
However, my trouble is with too and as well, I have been reading and I just found that as well is not common in American English, and regarding with the examples that I have found, those adverbs have the same meaning and you can use them in the same way and always at the end of the statement.
She was smart, she studied so much as well.
She was smart, she studied so much too.
How much of that information is true?