Irregular conjugation for the verbs with the ending -ingen: there is a vowel change in the stem of Present tense ("ich singe") and the stem of Preterite ("ich sang") and the stem of Past Participle ("gesunden").
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.