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ないといけない 【ないと行けない・無いといけない・無いと行けない】
  1. -Expressions (phrases, clauses, etc.)(after negative base of verb) have to (verb); must (verb) —word usually written using kana alone (see: 無きゃいけない)
  2. is indispensable; absolutely necessary
痩せる過酷な断食ないといけない思っているPeople who think that if they are to lose weight they must go on a strict fast.
列車遅れ見込んでおかないといけないWe have to allow for the delay of the train.
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