Types of verbs:
1.Intransitive complete verbs: These do not transfer the action. There is no receiver of an action.
Examples:
1.The bell rings.
2.He arrived.

2.Transitive active verbs: Unlike the intransitive verbs, these do transfer the action. There is a receiver of the action. It is called a direct object.
Examples:
1.He rings the bell.
2.She drinks milk.

3.Transitive passive verbs: In these, the receiver of the action is the subject. We use these verbs in the passive voice.
Examples:
1.A guitar was played (by Ramesh).
2.A letter was written (by Reena).

4. Intransitive linking verbs: These belong to the category of linking verbs. As they are intransitive, they do not transfer the action.
Examples:
1. I am happy.
2. The coffee is cold.

In the first sentence, we have connected I and Happy with ”am”.
In the second sentence, we have connected ‘The coffee’ & ‘cold’ with ‘is’.