Is it grammatically correct to use "is really" instead of "really is" here? Could you tell me the difference in nuance between those two?

Native speaker’s answer
Rebecca
Yes, it is grammatically correct to use "is really" instead of "really is", however there is a difference in nuance between the two. When you use "really is", this indicates that something is definitive or true. The phrase "is really" on the other hand usually just expresses a great amount. Here's an example of this difference: Ex: "It's hot in here" "Yes, it really is hot in here" Ex: She is really hungry.