tell me about verb as adjective

Words that are normally verbs can often be used as adjectives. If a word modifies a noun or pronoun, it is an adjective, even if that word is usually associated with a different part of speech.

Sometimes the present participle (verb plus ing) form of a verb becomes an adjective:

A rolling stone gathers no moss.

Sometimes the past participle form of a verb becomes an adjective:

I will accept a written apology.

Such adjectives are sometimes called participle adjectives.