Firstly , in our classroom you ca n't shout , you must be quite and sat .
Firstly , in our classroom you ca n't shout , you must be quiet and sit down .
Firstly , in our classroom you ca n't shout , you must be quiet and sit down .
Mejorar la gramaticalidad: Firstly , in our classroom you ca n't shout , you must be quite and sat . Producción: