Question

the man answered with promptness. .( use the adverb from of promptness to rewrite. the sentence)

Answer 1

The adverb form of promptness is promptly.

The sentence becomes: the man answered promptly or without delay.  

You can also write the sentence as the man answer efficiently.

The adverb form of promptness can be quickly, instantly, swiftly, rapidly, directly, expeditiously, punctually and fleetly.

The adverb would be providing the best description for a verb.

The best way to look for the adverb is to find the word that ends with “ly”.