Sonntag folgt auf Samstag.

English Translation

Sunday follows Saturday.

What’s wrong with “Sonntag folgt Samstag.”? What purpose is the “auf” in understanding the information?

A (nom) folgt B (dat) - is more like “tracking”, i.e. a continuous process. A follows B whereever B goes.
A (nom) folgt auf B (acc) - is about the order of a sequence.

gobbledygook! 13141516

  • folgen” (without “auf”) means “to follow” in the sense of “to walk behind someone”. You use this verb with “jemandem”. Example: He followed me. (Er folgte mir.)
  • auf etwas oder jemanden folgen” means “to follow” in the sense of “to come after” or “to be the successor”. Example: Sunday comes after Saturday. (Sonntag folgt auf Samstag.)