sur
on
on top of
upon
Pose ton téléphone sur la table.
Put your phone on the table.
about
concerning
on (a topic)
Un documentaire sur le climat sera diffusé ce soir.
A documentary about the climate will be broadcast tonight.
out of
over (in scores or proportions)
J'ai eu 18 sur 20 à mon test.
I got 18 out of 20 on my test.
Notes
GENERAL INFO
Sur is a preposition meaning "on," "on top of," or "about/concerning." It indicates position, location, or topic.
USAGE
Use it to describe something's physical location, e.g., "Le livre est sur la table" (The book is on the table). It also denotes a subject: "un film sur la guerre" (a film about the war).
TRAPS
Don't confuse sur with "sous" (under) or "vers" (towards). Remember that "on" in English can sometimes be "dans" (in) in French, e.g., "dans la rue" (on the street).
