pmda wrote:Sextus, qui ante Marcum et Titum ad ludum advenit, primus ludum intrat.
Primum means first (first in order, or for the first time), and implies a series of events or acts. Primo means at first, as opposed to afterwards, giving prominence merely to the difference of time :
hoc primum sentio, this I hold in the first place.
aedis primo ruere rebamur, at first we thought the house was falling.
NOTE. In enumerations, primum (or primo) is often followed by deinde, secondly, in the next place, or by tum, then, or by both in succession. Deinde may be several times repeated (secondly, thirdly, etc.). The series is often closed by denique or postremo, lastly, finally. Thus, -- primum de genere belli, deinde de maguitudine, tum de imperatore deligendo (Manil. 6), first of the kind of war, next of its magnitude, then of the choice of a commander.