Translation

• have no choice or option but to
• cannot but
• have to
• can't help it
• can't avoid

Synonyms

• 只好, 只得, 只能, 唯其如此

Examples

• 他们不得不后撤。
  They had no alternative but to retreat.
• 她不得不待在这儿。
  She has had to stay here.
• 我不得不照顾小孩们。
  I had to look after the children.
• 有时候，我不得不读一些无聊的小说。
  Sometimes I have to read boring novels.
• 我不得不一整天都待在床上。
  I have to stay in bed all day.