"About" is not a verb. It is a preposition or adverb, depending on how it is used.
A linking verb.
A linking verb
It is an irregular verb.
The verb appear can be a linking verb or an action verb.
An auxiliary verb
the infinative
Is becomes a verb
It is a regular verb
a regular verb.
Be is a state of being verb.
The kind that's actually a noun instead of a verb.
1 form of verb