A few verbs have characteristics of irregular and regular verbs: their ending (-te- + personal ending) is regular but they have a vowel change. We call these "mixed verbs".
The mixed verbs include, for example, wissen, bringen, denken and kennen.
| Infinitive | Simple past | Past Participle |
| wissen | wusste | gewusst |
| bringen | brachte | gebracht |
| denken | dachte | gedacht |
| kennen | kannte | gekannt |