「〜なければなりません」expresses obligation or necessity — "must ~" or "have to ~". Structure: verb ない-form (ない→なければ) ＋ なりません ✅ Mainichi benkyō shinakereba narimasen. (I must study every day.) ✅ Kusuri wo nomanakereba narimasen. (I have to take medicine.) ✅ Hayaku nenakereba narimasen. (I must go to bed early.) Conversion: nomu→nomanai→nomanakereba + narimasen taberu→tabenai→tabenakereba + narimasen 💡 In casual speech shortened to 〜なきゃ or 〜なきゃいけない