On : we
Look at these examples:
On est très proches, ma soeur et moi.We are very close, my sister and I. On va au cinéma ce soirWe're going to the cinema tonight.
This use of on is for a specific group of people which you're a part of (i.e. My friends and I).
Here on is equivalent in meaning to nous (we), though they aren't followed by the same conjugation of the verb:
On est gentils.We're nice. Nous sommes gentils.We're nice.
See also Nous vs on to say "we" in French (French Subject Pronouns)
On : one/you/people
You can also use on in a more general sense, as such:
Si on travaille dur, on gagne plusIf you work hard you earn more
Here on includes people in general, or can be a theoretical statement such as one [does that].
This form is often used when expressing rules such as:
On ne doit pas parler la bouche pleine.People mustn't speak with their mouths full.
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