For the verbs "senden", "wenden" and their compounds double conjugation is possible: 1) irregular conjugation: there is a vowel change in the stem of Present tense ("ich sende"), the stem of Preterite ("ich sandte") and the stem of Past Participle ("gesandt"). 2) Regular conjugation: with -e- in stem and endings -st, -t (Present tense: "du sendest" / "er sendet" ), -te (Preterite,"ich sendete" ) and -t for the Past Participle ("gesendet"). Other verbs with the ending -enden follow other conjugation pattern.
9 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.