πρέπει in English:

Użycie konstrukcji \"ought to\" sygnalizuje wątpliwość, czy odbiorca wypowiedzi zastosuje się do naszej rady lub wypełni obowiązek

We ought to spend more time relaxing

ought to do something

They ought to apologize.

Maybe you ought to go a little easy on the booze

He ought to have worn uniform, and yet he didn't.

I ought to study today.

I must go.

Now that he has graduated, he must become more serious.

All the delegates knew they must discuss it.

I will go if I must.

You lean on your parents too much. You must be more independent.

His doctoral thesis must be submitted to the professor by the end of the month.

The checked player must find a way for the king to escape and block the check.

I must have tried on everything in the shop, but nothing looked right on me.

Must we dress up?

Even if it costs 10,000 yen, I must buy the dictionary.

In order to qualify for the homestay you must have an interview with the sponsors.

It's already ten o'clock. My mother must be angry.

Under no circumstances must you leave the room.

What a good scholar the author must be to write such a splendid book!

In cold weather we must be sure to keep our bodies warm.