もんな

you know

→ もの

phrase Rare #35,120

you know An informal sentence ending used to emphasize a statement or remind the listener of something they both know. It can also suggest “after all.”

JA: 彼はよく知ってるもんな。

EN: You know he knows a lot.

ぜんぶ入ってるもんな

It’s got everything in it, after all.

— 火垂るの墓 (1988)

んー昨日のアレは目立ったもんな

Hmm, yesterday’s thing really stood out.

— 君の名は。 (2016)

でもそういうやつやったもんなあいつ

But he was always like that.

— Love Letter (1995)