Can I say "surely" instead of "sure" in this context?

Native speaker’s answer
Rebecca
Yes, you could! "Sure" is actually the more informal use of "surely" in this context. "Surely" is grammatically correct, but "sure" has become very common and is often said more than "surely," especially with the phrase "I sure hope." Ex: I surely hope you will finish your project on time. = I sure hope you will finish your project on time! Ex: I surely think you deserve the award. = I certainly think you deserve the award.