Question

Je __________ du ski tous les hivers. (faire)

Answer 1

'faire' is an irregular verb.
Look up its conjugation here :
http://www.bescherelle.com/conjugueur.php

Answer 2

Je __________ du ski tous les hivers. (faire) drop the –re replace with the ending – sais

I skied every winter.

I used to ski every winter.

I would ski every winter. ( in the past)