なぜなんだろう。
Sentence Analyzer
English Translation
I wonder why.
Furigana
なぜなんだろう。
Romanji
Naze na n darou.
Words
何故
(なぜ、なにゆえ)
why; how
だ
(だ)
be; is; indicates past or completed action; indicates light imperative
ん
(ん)
yes; yeah; uh huh; negative verb ending used in informal speech (abbr. of negative verb ending "nu"); abbr. of particle "no"; abbr. of particle "ni" (used especially when it precedes the verb "naru")