Perfect

Inseparable verbs form the past participle (Partizip II) without the use of the prefix "ge". The past participle (Partizip II) is identical to the 3rd person singular present. See more at "Past participle with/without -ge-".

 

Examples    
verkaufen
verkauft
verkauft
zerstören
zerstört
zerstört
     
infinitive
3rd person singular present
past participle (Partizip II)