Model: sitzen
Auxiliary: haben
Other forms: einsitzen/nicht einsitzen
Irregular conjugation for ther verb "sitzen" and its compounds: there is a a vowel change in the stem of Present tense ("ich sitze") and the stem of Preterite ("ich saß") and the stem of Past Participle ("gesessen").
Präsens
Präteritum
Perfekt
Plusquamperfekt
Futur II
Futur I