んだい
Turns sentence A into a question (casual).
JLPT
N4
Istruktura
(A)N+な+んだい Adjい+ん+だい Adjな+ん+だい (A)V(Casual)+ん+だい
Ibig sabihin
Cannot be used with yes/no questions.
なぜそういう
映画
が
好
きなんだい
?
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Turns sentence A into a question (casual).