should know
Don Patricio, que acompanha a contagem, deve saber.
Don Patricio, who is following the count, must know.
— No (2012)
Ele não diz nada, mas deve saber alguma coisa.
He doesn't say anything, but he must know something.
Sr. Strauss, há certas coisas sobre meu passado que o senhor deve saber.
Mr. Strauss, there are certain things about my past that you should know.
— Oppenheimer (2023)
Someone must know.
Deve saber tudo sobre Hogwarts.
You should know everything about Hogwarts.
— Harry Potter e a Pedra Filosofal (2001)