Answer:
Ravi quickly reads mystery novels. ⇒⇒ This verb expresses an action.
Read is the verb in this instance that represents the action of reading.
Ravi quickly reads mystery novels. ⇒⇒ This adjective describes a person, place, or thing.
The adjective mystery in this sentence is used to describe the type of novels that Ravi reads.
Ravi quickly reads mystery novels. ⇒⇒ This noun is a person, place, or thing.
Ravi is the name of the person doing the reading here and so is a noun.
Ravi quickly reads mystery novels. ⇒⇒ This adverb describes how an action is completed.
Quickly is the adverbial form of the adjective quick and in this case is being used to describe how Ravi reads the novels.
