Ответ на этот вопрос очень простой - так же как и глагол have без частицы to. В третьем лице единственного числа имеем форму has to, во всех остальных случаях - have to:
Если модальные глаголы must или should не изменяются по лицу и числу, то здесь действует правилоhaveto / has to .
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A modal verb is an action word that conveys possibility or necessity. In the affirmative we use the following equation: subject + modal (hasto/have to) + verb.
People havetohave an identity card. (İnsanlar bir kimlik belgesine sahip olmak zorunda). We have to stay at the hotel tonight. (Bu gece otelde kalmak zorundayız).