"Sur" is the proper word for meaning on top in french.
'on top' is 'par dessus' in French.
par dessus ça, il a cassé la voiture > on top of that, he broke the car.
par dessus, au dessus
At the top is "au sommet" in French.
sur.
A cherry on top in French is - Cerise sur le gâteau.
au sommet, au top niveau
Dernier etage.
"retour au sommet"
'ondules' but there has to be a comma on top of the 'e'.
If you mean attic (top of the house) it is grenier in French (literaly the place where you store grain)
camisole, or t-shirt sans manches
Use all of your spare time revising
"The yellow bananas" are "les bananes jaunes" in French.
les petits