speak Spanish, please

I don't understand what you are saying. Speak Spanish, please.
No entiendo lo que dices. Habla español, por favor.
Speak Spanish, please. I don't understand English.
Hable español, por favor. No entiendo inglés.
Can you speak Spanish, please? We can't understand you.
¿Puedes hablar español, por favor? No te entendemos.
Students, you will not learn the language if you don't practice it, so speak Spanish, please.
Alumnos, no van a aprender el idioma si no lo practican, así que hablen español, por favor.
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