Spanish phrase
No se debe ~.
Meaning
One should not ___.
When to use it
Indicates that an action should be avoided. Used for rules, polite warnings, or general advice in neutral or formal contexts.
Example dialogue
¿Puedo usar el teléfono en clase?
Can I use my phone in class?
No se debe usar el teléfono en clase.
One should not use a phone in class.