"¿Ustedes tienen que ir al supermercado?"
Translation:Do you have to go to the supermarket?
Must go sounds like one doesn't have a choice. And must/should is deber.
I thought that should be " Do you have yo go" not 'need'. At least 'tener que' was in previous lessons?
When I used 'need to' instead of 'have to' for 'tener que' as I thought it was pretty much interchangeable, I was marked wrong. Why has Duo suddenly changed its tune?
You may have made a different error, Michle. Duo's default answer to this exercise is "Do you need to go to the supermarket?"
I believe tener que can mean either "to have to" or "to need to." Here's a link to an article that uses examples of "to need to": https://www.espanolavanzado.com/gramatica-avanzada/1282-tener-que-vs-necesitar