N4 - 以外いがい
with the exception of
N4 - 以上いじょう
more than, this is all
N3 - 以前いぜん
ago, since, before, previous
N3 - 以来いらい
since, henceforth
N2 - 以後いご
after this, from now on, hereafter, thereafter
N2 - 以降いこう
on and after, hereafter, thereafter
N1 - 以てもって
with, by, by means of, because, in view of