Learn French: Le prix du fret fluctue selon que tu expédies aujourd'hui ou demain. - The freight price fluctuates depending on whether you ship today or tomorrow.

Even though it introduces a condition, selon que deals with objective alternatives rather than subjective feelings, doubts, or obligations. Because of this, it is always followed by the indicative mood. Here, tu expédies is in the standard present indicative.

Could I use suivant que instead of selon que?

Yes! Suivant que means exactly the same thing ("depending on whether") and operates under the exact same grammatical rules, including taking the indicative. You will hear both used interchangeably in French.

Why use expédies instead of envoies?

While envoyer is the everyday word for "to send", expédier specifically means "to ship" or "to dispatch". Since the sentence talks about le fret (freight or commercial cargo), expédier is the more precise, professional vocabulary choice.

Does the word fret follow normal pronunciation rules?

No, it is a common exception! The final "t" in fret is usually pronounced (sounding like "frett"). It is the standard French term used in logistics for cargo or freight.