Sentence examples for really quickly from inspiring English sources

"really quickly" is grammatically correct and can be used in written English
It is used to describe an action or event that is done in a fast manner. Example: "She finished her exams really quickly and went on vacation." In this sentence, "really quickly" emphasizes the speed at which the person finished their exams. It could also be used in a sentence like, "He ran really quickly to catch the bus."