These verbs are almost regular. Only past participle is irregular.
 
abrir - to open - abierto
cubrir - to cover - cubierto
describir - to describe - descrito
descubrir - to discover - descubierto
escribir - to write - escrito
 
 
Most of the verb conjugations including English translation used in this website are based on Fred Jehle's Spanish Verb Database which was compiled by Brian Ghidinelli.
ghidinelli.com-free-spanish-conjugated-verb-database