NOTE...
YOU USE REALLY in conversation and in less formal writing to emfhatize something that you are saying.

REALLY usually goes in front of a verb,or in front of an adjective or adverb,

I really enyoed that,
It was really good,
He did really carefully,


You can put really in front or after an auxiliary verb.for example.you can say  He really is coming .or He is really coming.there is no difference in meaning.

We really are expecting it to be a best  seller,
It would really be too much trouble