Intransitive Verbs Definition

An intransitive verb is a verb

 that can express a complete thought without necessarily exerting its action on an object.

A sentence composed of the intransitive verb does not have any single word that describes the object that received the action of the verb.
Intransitive verbs are either followed by a word or phrase, and such words or phrases typically answer the question “how”?

Intransitive verbs don’t require a direct object to express a complete thought. 
👉She moved on.
Here the subject is “she” and the intransitive verb is “moved on”. You can add an adverb such as “immediately” to describe how she moved on, and it’s still not a complex sentence.

The contrast to transitive verbs, as we have mentioned earlier, are intransitive verbs. Those are the kinds of verbs that do not necessitate objects. Another key to recognizing those types of verbs is that they are primary action verbs. 
👉Anna went home.
👉Derrick swims.
👉John dies at the end.
👉The dog lies in front of the house.
👉Children sit in the classroom.

🍭Intransitive Verbs and Prepositions
A prepositional phrase or an adverb comes after an intransitive verb in a sentence to add more information to the thought being expressed. A noun no longer follows intransitive verbs because it acts as an object.
👉He sat at the bank of the river.
👉He trained before it rained.
“On the bank of the river” is a prepositional phrase that answers the question “Where did he sit?”. “Before it rained” is a prepositional phrase that describes when he trained.

Ambitransitive Verbs
***verbs that go both ways
👉She eats –intransitive
👉She eats oranges that she helped pick three days ago at her grandparents’ farm. –  transitive.

Transitive verbs are followed by direct objects which may be a noun or a phrase which require to exert their action on a direct object to express a complete thought.
Intransitive verbs are complete on their own which do not contain a direct object.