ты должен делать

you must do

→ ты
phrase Rare #38,816
you must do Used to tell one person informally that they are obligated or expected to do something. Often followed by what they need to do.
RU: Ты должен делать домашнюю работу каждый вечер.
EN: You must do your homework every evening.

Ты должен делать, как я скажу?

Are you supposed to do as I say?

— Терминатор 2: Судный день (1991)

Ты должен делать это гораздо осторожнее.

You have to do this much more carefully.