Candace asks Ferb to tell the aliens that she wants a little time to herself. Ferb then relays that message in the "Martian" language, which is really English played backwards. The Martian replies, and Ferb translates the reply as "They say 'fine', but not without them." What makes the whole conversation odd is that if you play Ferb's "Martian speak" backwards, he says in backwards-English TO the Martian, "They say 'fine', but not without them" - he's actually giving the answer as the question.