以前

N2 以後 igo after this; from now on; hereafter N2 以降 ikou on and after, hereafter N2 前～ zen～ former, late ~, past ~ N2 前後 zengo front and back, before and after N2 直前 chokuzen just before N2 手前 temae before, this side N3 当たり前 atarimae natural, obvious, common N3 以来 irai since then, since, henceforth N3 お前 omae you, informal or rude depending on context

N4 以 i / motsu.te by means of, because, in view of N5 前 zen / mae, -mae in front, before, devant