Here's a handy one if you like to combine music and mnemonics-- plus it gets us away from medicine and math and into the finer arts!
The most common French verbs that take etre instead of avoir Thanks for catching my earlier inversion! Wouldn't want give you all a bum steer!!
Forgive some spelling mistakes, it's been over 50 years since I learned it.

Alle, parti, sorti, venu,
Devenue, retourne.
Arrive, reste, rentre, entre,
Tombe,nee, et morte.