have to (EN)
動詞

動詞 “have to”

have to; he has to; past had to, part. had to; ger. having to
  1. しなければならない
    I have to finish my homework before I can go out to play.
  2. ~に違いない (結論として他に考えられない場合)
    She has to be the teacher because she's holding all the textbooks.