不得 (bù dé): Must not (Verb) — Meaning & Stroke Order

I have to decline this invitation

Facing difficulties, we can do nothing

He had to accept the challenge for the sake of his dignity.

Because of the rain, we had to cancel our plans

Because it's raining, we have to cancel the picnic.

To complete the project, he had to work through the night.

Due to the sudden change in weather, the scheduled outdoor activity had to be cancelled.