"They sell a lot of spices and oils."

[Sjdps]

why "spicoj" and "oleoj" are not in accusative?

[sheldolina]

Because you don't use the accusative after a preposition (except sometimes to indicate direction, which isn't the case here). You would say "Ili vendas spicojn kaj oleojn", but the -n isn't used after "da".

[BonnieFoxx]

Thank you for that explanation. Have a lingot! :)

[consultjohan]

Ili vendas multajn spicojn kaj oleojn?

[clh335763]

Mi havas saman demandon

[guyfef]

Kial estas "multe da" kaj ne la vorton "multe de"?
I mean it speaks of what they are selling and not how much

[AjxojLerni]

no, think of multe as an indefinite quantity. As a rule, da, not de, follows it.