According to Oxford Learner's Dictionary:
real adverb
(North American English, Scottish English, informal) very
- That tastes real good.
- He's a real nice guy.
- I'm real sorry.
So, is it correct to use "really" instead of "real" in the examples above?
Now, let's put some other examples:
a. It's a real small town
b. It's a really small town
c. It's really a small town
Are all these three correct? Do they mean the same?