The past participle (Partizip II) of irregular verbs is formed with the prefix ge-, the present perfect stem and the ending -en.
| infinitive | past participle (Partizip II) |
| lesen | ge-les-en |
| fahren | ge-fahr-en |
| bitten | ge-bet-en |
| gehen | ge-gang-en |
| treffen | ge-troff-en |