En español basta con la entonación: ¿Hablas inglés? En inglés, con casi todos los verbos, hace falta un auxiliar: do, o does con he, she, it.

	I / you / we / they	he / she / it
+	I speak	she speaks
−	I don't speak	she doesn't speak
?	Do you speak?	Does she speak?

• Don't = do not; doesn't = does not.
• Con does y doesn't, la -s ya está en el auxiliar, así que el verbo vuelve a la forma base: Does she live here? She doesn't live here.
• Igual que la -s, does va con cualquier sujeto singular: Does Luana speak Spanish?
• Las respuestas cortas repiten el auxiliar, no el verbo: Do you speak English? — Yes, I do. / No, I don't. Does she live here? — Yes, she does. / No, she doesn't.