N2 — outside your level filter
Modifies the end of the sentence directly and takes no だ／です, so there are no forms to conjugate.
いつのまにか
itsunomanikabefore one notices, without realisingN2adverb
Example sentences2
いつのまにか外は暗くなっていました。
itsunomanika soto wa kuraku natte imashita.
Before I knew it, it had gotten dark outside. neutral
いつのまにか寝ちゃってた。
itsunomanika nechatteta.
I ended up falling asleep without realising it. casual