some

any (partitive pronoun replacing de + noun)

of it

of them

about it/them

from there

from it (replacing de + place)

in

at

on — indicates location, time, language, material or state (en France, en hiver, ...)

by

with

while

within — indicates means, manner or duration

used with a present participle to mean 'while' or 'by' (en voiture, en travaillant, fini en deux heures)