Verb forms

Japanese
#22

That’s why once again I’m telling you there is :
Old japanese grammar
Modern japanese grammar
Translation

https://www.tanoshiijapanese.com/dictionary/conjugation_details.cfm?entry_id=103243&element_id=128958&conjugation_type_id=5
https://conjugueur.reverso.net/conjugaison-japonais-verbe-だ.html

Hoping this helps you since you seem to not trust bunpro.

#23

Alright there’s a distinction between formal and polite that might be confusing things. であるis formal, but not 丁寧語. That’s why there’s very little use for it in the spoken word, but it’s used very often in stuff like academic texts.