A verb, from the Latin “verbum” meaning word, is a word of (part of speech):

It shows state “he is sleeping”.

This shows an action ” he reads loudly”.

Shows possession “I have a pen”.

Shows happening “it is raining”.

So the verb is only the word in a sentence that is changed, but any other parts of speech remain the same.

Kinds of verbs.

Non-finite (/ˌnɑːnˈfaɪ.naɪt/)

Finite (/ˈfaɪ.naɪt/)

Here are the chat of all verbs to understand easily.