pronoun
The word "POLISHED" in caps in the sentence functions as a verb.
The word "NOT" functions as an adverb modifying the verb "polished" by indicating the absence of action in the sentence.
The word "tarnish" in the sentence "the silver will tarnish if it is not polished often" is a verb. It is describing the action of the silver in the sentence.
The is a definite article. In the sentence it is used to indicate something that is clearly understood from the situation (tarnish).
The word "tarnish" in the sentence "the silver will tarnish if it is not polished often" is a verb. It is describing the action of the silver in the sentence.
The word "tarnish" in the sentence "the silver will tarnish if it is not polished often" is a verb. It is describing the action of the silver in the sentence.
adverb
If you don't it will tarnish.
The silverware had tarnish on it, so she polished it to restore its shine.
The word "EASILY" is an adverb in this sentence. It modifies the verb "removed," indicating how the tarnish can be removed.
Adverb
Sterling will tarnish, but if you keep it regularly polished it won't be a problem at all.