Here's why:
* "Est-ce que" is used to introduce a question in French.
* "Tu" means "you" in French.
* "Pas" means "not" in French.
To make a proper sentence, we need a verb.
Here are some possibilities based on what the speaker might have meant:
* "Est-ce que tu passes?" - Do you pass? (referring to passing something or a test)
* "Est-ce que tu pars?" - Are you leaving?
* "Est-ce que tu peux?" - Can you?
* "Est-ce que tu vas?" - Are you going?
To understand the intended meaning, you need more context!