Is walking an adverb

Answer 1

no, it is a verb or noun.

an adverb describes an adjective or a veb. the word "walk" cannot do that.

you can use it as a verb:

I walk to the store everyday.

you can use it as a noun:

I take a leisurely walk sometimes.

Answer 2

No, it is a past-tense verb.

To walk, or walking, is an action. Hence, verb.

Changing it to walked makes it past-tense because it already happened.

Answer 3

Walking is not an adverb, but It can be used as an adjective or adverb in a participial phrase. (e.g. The man walking toward us seemed dizzy.)

It is a verb form or a gerund (noun).