"Změníš-li něco, řekni mi o tom!"

Translation: If you change something, tell me about it!

[Monika.Rosemary]

This is a quite difficult way of expressing the conditional. A bit easier (and way more used) is "Jestli něco změníš..."

[nueby]

I wanted to teach multiple ways.

[Lyn581999]

Thank you for teaching this, I just learned about -li and was confused. This helps! :)