@JeanLucDelhaye and in general
- viens-tu ? is indeed rather formal, but used by the well educated.
- est-ce que tu viens ? is rather used by the poorly educated.
- “ tu viens ? ” is correct (and usual) french language.
“poorly educated”. Seems like an ad hominem argument (i.e. not an argument).
I would argue that asking a question in a non-question format such as “tu viens?”, leaving only the verbal intonation to determine if it’s a question or a statement is poor usage of the language. Yes, it’s used in France, but so what? They also “do races” (faire des courses) when going shopping or “faire du shopping” which is even worse.
I remember Memrise marking as a mistake questions such as “viens-tu?”, which is a correct ‘question-form’ sentence. Adding “est-ce que” in front of a ‘statement-form’ sentence also creates a question.