What is the comparative and superlative forms for rapidly?

"Rapidly" is an adverb, and adverbs don't have comparative and superlative forms in the same way adjectives do.

To express different degrees of speed, you would use other adverbs:

* More rapidly (comparative) - This is used when comparing the speed of two actions.

* Most rapidly (superlative) - This is used when comparing the speed of more than two actions.

You could also use words like:

* Faster

* Fastest

* More quickly

* Most quickly

Example:

* He walked rapidly, but the others walked more rapidly.

* The cheetah runs most rapidly of all animals.