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").
20 verbs follow this model. Below an extract:
To see other models, refer to Model Table
Based on the ending, you can identify features that different verbs have in common. Click on the verbs above to see their conjugation tables and explore their conjugation patterns.