Błędnie: Sandy said those furnitures were by no means disgusting- don't even try to persuade her into buying them. Poprawnie: Sandy said that furniture was by no means disgusting- don't even try to persuade her into buying it.
"Furniture" ('meble') to rzeczownik niepoliczalny. Jeśli chcemy powiedzieć o pojedynczym meblu, używamy zwrotu "a piece/ an item of furniture".