I read a sentence in a book. In the sentence, 'you' and 'is' have been used together. Can I rewrite it with 'are'?
The real you is inside of you.
No, you can't, because here the "is" is used together with "the real you", which is not the same as just the pronoun "you". "The real you" is a synonym for "your real self" or "your real personality" among others. That is why, "is" is used and not "are".