Porque se usa un "no" en este frase?

Question

En la frase, Hasta que (no) compre su boleto, no puede entrar en el cine. o se puede decir Hasta que compre su boleto, no puede entrar en el cine. Que significa (no) en la primera frase?

Answer 1

I am not sure exactly what you are asking, but the "no" in the first phrase: It is something like if you don't buy your ticket, you can't enter the cinema (movies).

In the second phrase, it is more like: Until you buy your ticket, you can't enter the cinema (movies).

My professor said that they were both the same and you could use both. Thank you for explaining the difference. - Louisette, ABR 11, 2010

Answer 2

Rolest has the right idea. In Spanish, we must use double negatives whereas in English we must not.