Are “ter de….” and “dever” synonyms/interchangable?
Obrigado e cumprimentos, Paul
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Olá, @amcpps 
As this (pertinent) question has been asked before, let me point you to this other topic where it was first answered in detail: Confused about the verb "Dever" - #5 by Joseph
Please feel free to ask any follow-up questions over there, especially if you don’t understand all the Portuguese, since I will close this topic just to avoid content duplication.