#adverb between negation or out
1 messages · Page 1 of 1 (latest)
Both are correct but they mean different things: really not (you say the negation of your understanding is intensified by the fact you really mean it) for the first and not really (you say you actually don't understand a lot, you're not sure you understand anything) for the second.
It comes down to knowing which adverb modifies which adverb.
like the first is : i really dont understand
and the second ; i dont really understand
did i get it right