"Do you understand now?"
Translation:¿Ustedes entienden ahora?
Julian is pointing out three errors there Nikos. Firstly, you used té (which means "tea") instead of tú (the 2nd person informal subject, not actually necessary; secondly, you conjugaged the verb incorrectly - using the 1st person -o ending instead of the correct entiendes. Thirdly, you missed out tbe "n". But your idea is correct - it is an alternative. As is the singular formal usted entiende.... Hope that helps.