不得不 (bù dé bù): have to, cannot but

It's raining, so I have no choice but to bring an umbrella.

Because there is an exam tomorrow, I have no choice but to review.

He is sick, so he has no choice but to go to the hospital.

There is a traffic jam on the road, so we have no choice but to change our plans.

In order to make a living, he has no choice but to work hard.

Because it rained, we had to cancel the match.

He had no choice but to admit he was wrong.

Time is tight, so I have to speed up.

To make a living, she has to work twelve hours a day.