This is the 1931st most frequent Chinese word.
很快
"Very fast" or "soon."
In this sentence, '很快' is used as an adverb to describe the manner in which 'he' runs, indicating the speed or swiftness of the action.
他跑得很快。
He runs very quickly.
'很快' in this context is used to describe the speed at which the weather changes or improves, denoting rapid transformation.
天气很快就变好了。
The weather improved very quickly.
Here, '很快' is used to indicate the promptness or speed of the speaker's arrival at the school, emphasizing the short duration or fast action.