1. Impersonal and passive
"se"

2. se
Impersonal se plus a verb can be used to talk about generalizations,
about what is or isn’t done somewhere.
The subject is never specified, and the verb is only used in the third-person singular / plural forms.

3. se + verbo
third person singular
third person plural

4. English is spoken in United States. Se habla inglés en Estados Unidos.
One works a lot in this country.
Se trabaja mucho en este país.
People eat a lot of vegetables.
Se comen muchas verduras.

5. se
The impersonal construction se+verb often corresponds to sentences in English that use people, they, you, we, or one as the subject.
Some common expressions about what is or isn’t allowed somewhere are:

6. prohibir
to prohibit

7. third person singular or plural
se prohíbe
se prohíben
is prohibited

8. permitir
to allow

9. third person singular or plural
se permite
se permiten
is allowed

10. Se prohíben teléfonos celulares

11. Se prohíbe fumar

12. Se prohíbe comida

14. Se debe....
One should...

15. Se puede....
One can...