"Are" is the verb in that sentence, and it's a linking verb. It links the subject (Sammi and Tonya) to the complement (close friends).
are
It can be. close / closed I close the door every night. She closed the door with a bang. It can also be an adjective. He had a closed circle of friends.
Close is a transitive verb because the word, "close" needs and object to identify the verb.
verb
Close can be an action verb: to close the door, or close the sale, or close your eyes.
"Close the door." is a complete sentence. The direct object is door.
The verb form of closure is "close." For example, "I will close the door" or "She closed the shop for the day."
The word friend, meaning "close companion" is a noun. The word meaning "to befriend" is a verb. Adjectives include friendly and befriended, or friendless.
"Together with his friends" is an example of an uninterrupted verb phrase, where the phrase "with his friends" adds information but does not interrupt the main verb "together."
close as in close the door ---- shut close as in she is standing close to me ---- near
Please close the door.
Close is a verb, a noun, and an adjective.Verb: Please close the door.Noun: He left at the close of school.Adjective: Kathy and Jean have a close relationship.