でなければならない

でなければならない, でなければいけない, でなければならぬdenakerebanaranai

expression

  1. having to be
  2. must be
  3. should be
  4. ought to be

Study it in Yanamino

Data from JMdict, KANJIDIC2 (EDRDG), KanjiVG, CC-CEDICT and Make Me a Hanzi. Sources and licences