Verbs Express Actions
Verbs are doing words. A verb can express:
A physical action (e.g., to swim, to write, to climb).
A mental action (e.g., to think, to guess, to consider).
A state of being (e.g., to be, to exist, to appear).
The verbs which express a state of being are the ones which take a little practice to spot, but, actually, they are the most common. The most common verb is the verb to be. That's the one which goes: