No hables tan rápido.
English: Don't speak so fast.
The 'imperativo negativo' in Spanish is used to tell someone not to do something. It is the negative form of commands or instructions.
Use the imperativo negativo when you want to give orders, advice, or instructions telling someone not to do something.
No hables tan rápido.
English: Don't speak so fast.
No comas eso.
English: Don't eat that.
No salgamos tarde.
English: Let's not leave late.
No escribáis en la mesa.
English: Don't write on the table.
No miren la pantalla.
English: Don't look at the screen.