冬ふゆ に は 厚あつい 布ふ団とん が 必ひつ要よう です。fuyu ni wa atsui futon ga hitsuyou desu.A thick futon is needed in winter.Breakdown of fuyu ni wa atsui futon ga hitsuyou desu.ですdesuto beはwatopic particleがgasubject particleにniat; on; in; to; for [indirect object particle]