"You don't need a taxi."
Translation:Tú no necesitas un taxi.
Marion, it's from the verb necesitar - to need.
If you remember your present tense verb conjugations:
yo necesito - I need
tú necesitas - you need
él necesita - he needs
usted necesita - you need
ella necesita - She needs
ellos necesitan - they need
So, tú no necesitas un taxi - you don't need a taxi.
It could also have been usted no necesita un taxi, 'you don't need a taxi' using the Usted you formal form.
Just don't forget to match the conjugations correctly:
tú necesitas, usted necesita
i wrote "no necesitas un taxi" and it was marked wrong that it should be "no precisa un taxi"! something isnt right
I have a suggestion for duolingo.. when asking a multiple choice question, you should make the choice sentences almost the same but move the words around. The choices you give are so different from the correct sentence making it WAY too easy. You would have to be brain dead to get it wrong.