Practice.
Answer first, then read the explanation. Don't skip it — that's the whole point.
Hoy yo _____ terminar el informe antes de las cinco. (deber)
Today I must finish the report before five.
Si te duele tanto, _____ ir al médico. (deber)
If it hurts that much, you should go to the doctor.
No contesta al teléfono; _____ de estar en el metro. (deber)
He isn't answering the phone; he must be on the metro.
Nosotros _____ respetar las normas del edificio como todos. (deber)
We must follow the building rules like everyone else.
Los pasajeros _____ presentarse en la puerta de embarque media hora antes. (deber)
Passengers must be at the boarding gate half an hour before departure.
Te _____ una disculpa por lo de ayer; me porté fatal. (deber)
I owe you an apology for yesterday; I behaved terribly.
¿Cuánto le _____ tú todavía al banco por el coche? (deber)
How much do you still owe the bank for the car?
Todo conductor _____ llevar el cinturón puesto. (deber)
Every driver must wear a seat belt.
Mi hermano y yo _____ visitar más a la abuela; está muy sola. (deber)
My brother and I should visit our grandmother more; she's very lonely.
Mis vecinos no están; _____ de estar de vacaciones. (deber)
My neighbours aren't in; they must be on holiday.
Vosotros _____ decidir antes del viernes si venís o no. (deber)
You (all) must decide before Friday whether you're coming or not.
No _____ comer tanto por la noche; luego duermo fatal. (deber)
I shouldn't eat so much at night; I sleep terribly afterwards.
Tú no _____ preocuparte por eso; ya está solucionado. (deber)
You shouldn't worry about that; it's already sorted.
El ministro _____ una explicación a los ciudadanos. (deber)
The minister owes the public an explanation.
Not just a green check. A short paragraph telling you why.
No streaks, no points, no leaderboards. Just questions.
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