"Should I call her"
Is "Debo llamar" the correct translation for "should I call her?"
3 Answers
"¿Debo llamarla?" or "¿La debo llamar?" are the two reasonable alternatives. "debería" shifts the discussion into the past ("Should I have called her?").
You have to use the conditional "debería". If you say "debo" sounds more like something you have to do (wether you like or not) or because is your duty to make that phonecall.
Debo llamar ella.