Sur. Super. Sub.
"Sur" means "on, upon" (touching). "Li sidas sur la kanapo", He is
sitting on the sofa. Followed by the accusative (with "n") it means "on
to", as "Sidigxu sur la kanapon", Sit down on the sofa. "Influi sur la
karakteron", To have influence on the character.
"Super" means "over, above" (not touching). "Super la maro flugis la
nuboj", Over the sea floated the clouds. Followed by the accusative it
shows motion over and above a thing, as "Li jxetis sxtonon super la
muron", He threw a stone over the wall.
"Sub" means "under, underneath". "La hundo kusxis sub la tablo", The
dog lay under the table. With the accusative "sub" shows motion to and
beneath, as "La hundo kuris sub la tablon", The dog ran under the table.