do I have to?
トムは今日家にいなきゃ駄目なの?
Does Tom have to stay home today?
今すぐ行かなきゃ駄目なの?
Do I really have to go right now?
なぜ駄目なの?
Why not?
— 荒野の用心棒 (1964)
この手紙、英語で書かなきゃ駄目なの?
Do I have to write this letter in English?