What is a Verb?

In each of the following sentences, the verb or compound verb is highlighted:

Dracula bites his victims on the neck.

The verb "bites" describes the action Dracula takes.

In early October, Giselle will plant twenty tulip bulbs.

Here the compound verb "will plant" describes an action that will take place in the future.

My first teacher was Miss Crawford, but I remember the janitor Mr. Weatherbee more vividly.

In this sentence, the verb "was" (the simple past tense of "is") identifies a particular person and the verb "remembered" describes a mental action.

Karl Creelman bicycled around in world in 1899, but his diaries and his bicycle were destroyed.

In this sentence, the compound verb "were destroyed" describes an action which took place in the past.