In grammar what function do adjectives perform?

A sentence must make sense.

What type of noun is "bunch" in the sentence "The bunch of grapes was very delicious"?

Does a sentence always finish with a fullstop?

He really enjoys running. What part of speech is "running"?

The horses are galloping. What is the tense of the verb?

He rang the bell. What is the tense of the verb?

You could go to the shops. What form of pronoun is "You"?

What part of speech is "very" in this sentence? "This very interesting person contacted me last week."

A finite verb always has a subject.