yes
Yes it is a verb.
No, "sell" is not a common noun; it is a verb that refers to the action of exchanging goods or services for money. Common nouns are general names for people, places, things, or ideas, such as "dog," "city," or "happiness." In contrast, "sell" describes an action rather than naming a specific entity.
Advertise is already a verb. For example "to advertise something" is an action and therefore a verb.
To Sell
sell
Transitive Verb.
Sold is a verb. It's the past tense of sell.
It is an action verb.
began is an action verb, not a linking verb.
action verb because you did this action (sent)
what follows a linking or action verb
It is an action verb.
Action verb
Action verb
action verb
An action verb
The verb stay is an action verb.