Eu mănânc / tu mănânci / el mănâncă / noi mâncăm / voi mâncați / ei ele mănâncă / participle = mâncat / gerund = mâncând
all one of the verbs you gave followed the same pattern, that's 100% regularity.
I mean: are most verbs conjugated the same?
most irregularities happen at 1st and 3rd person: eu beau / tu bei (same "i" as in "a mânca" / el bea / noi bem (same "m") / voi beți (same "ți") / ei beau (same as 1st pers. sg.)
There are 4 conjugations and within the conjugations certain groups of verbs are conjugated differently to those in the same conjugation. So I would say pretty irregular.
Romance languages are the group of languages which evolved from vulgar Latin. Mainly: Italian, French, Spanish, Portuguese, Romanian. (there are a bunch of others, though).
"Mancama" This word does not exist, look at the complete conjugation of the verb:
"Noi mâncăm sau bem." The repetition of words should be avoided. The form is the same for interogative and afirmative sentences, it is enough to put the question mark "?"
"Azi mâncăm sau bem?" was the question we asked every morning when we were students and penniless.