It's a verb, a compound verb made from the infinitive stem "be" and the auxiliary "can". In addition, "Can be" can be a helping verb phrase, e.g. "Tom can be helping the younger kids". Can be is helping the verb helping.
The part of speech for "answer" is a noun.
part of speech
The part of speech for this particular word is a noun.
what part of speech is beneath
what part of speech is work
adverb
The part of speech for "explicit" is an adjective.
The part of speech for "twirl" is a verb.
The part of speech of "came" is a verb.
The part of speech for "buried" is a verb.
The part of speech for "rapid" is an adjective.
The part of speech for "lecturer" is a noun.