"We use them."
Translation:Noi li usiamo.
"Gli" is an indirect object pronoun. There is no indirect object in this sentence.
I wrote : "noi le usiamo" and it was correct. Now, what's the différence between "noi le usiamo" and "noi li usiamo" ?
The only thing I can think of is that 'le' is feminine and 'li' masculine according to notes i have found, but i could well be wrong!