Turn this distinction into automatic recall
Falando teaches Brazilian Portuguese through grammar, vocabulary, audio, examples, and spaced review, so confusing pairs stop feeling like guesses.
Quick answer
Dever ranges from advice to duty. Ter de and ter que state practical necessity, with ter que especially common in Brazil.
A reliable test is to identify the job of the word before translating from English.
What each word does
dever
should, must, or owe
Use dever for advice, duty, expectation, probability, or a debt.
ter de
to have to
Use ter de for necessity or obligation in neutral and careful language.
ter que
to have to
Use ter que for necessity or obligation in very common Brazilian speech.
How to choose
- dever: Choose dever if the sentence points to advice, duty, expectation, probability, or a debt.
- ter de: Choose ter de if the sentence points to necessity or obligation in neutral and careful language.
- ter que: Choose ter que if the sentence points to necessity or obligation in very common Brazilian speech.
Examples
Você deve descansar.
You should rest.
Tenho de sair agora.
I have to leave now.
Tenho que trabalhar amanhã.
I have to work tomorrow.
Common trap
Context decides whether deve means should, must, probably is, or owes. Use ter de or ter que when obligation must be unmistakable.
Practice it in context
Pick one sentence from your real life and write it twice: once with dever, then once with ter de. If both versions feel possible, name the meaning shift.
Turn this distinction into automatic recall
Falando teaches Brazilian Portuguese through grammar, vocabulary, audio, examples, and spaced review, so confusing pairs stop feeling like guesses.