Verbs are usually action words. They indicate what the subject of each clause is doing. That’s why you cannot have a sentence without at least one main verb.
Here is a sentence with two clauses, and therefore two verbs:
When I remember my childhood, I become sentimental.
The sentence also reveals that not every verb is clearly an action. The verb become shows a change or a process. These abstract verbs are less about action, and more about describing a state of being (many of them are linking verbs).
So let’s dig in and learn about the different kinds of verbs.