Model: brennen
Auxiliary: haben
Other forms: sich kennen/nicht kennen
Irregular conjugation for the verbs with the ending -ennen: there is a vowel change in the stem of Present tense ("ich brenne") , the stem of Preterite ("ich brannte") and the stem of Past Participle ("gebrannt"). !!The verb "trennen" and its compounds are conjugated regularly
Präsens
Präteritum
Futur I
Perfekt
Plusquamperfekt
Futur II
zu + Infinitiv