Must and be are auxiliary verbs, and added is a past tense verb.
adjective
"-ical" isn't any part of speech. It's a suffix (noun) added to a word to create an adjective.
a noun
determines its part of speech.
noun
When "ite" is added to a word, it typically creates a noun.
The part of speech that arium is a suffix. It comes from the Latin language. Some words it is used in include aquarium and planetarium.
It must be an adjective.
ite added to the end of a word is called a suffix. It creates a noun.
"Bi" can function as a prefix in English, typically meaning "two" or "twice." It is not a standalone part of speech but a morpheme that can be added to words to modify their meaning.
It is a verb or verb phrase.
A direct object must be a noun or pronoun.