Model: schalten
Auxiliary: haben
Other forms: sich umschalten/nicht umschalten
Irregular conjugation for the verb "halten" and its compounds: stem vowel mutation (umlaut) in singular form of the second and third person in Present tense ("du hältst"). There is a vowel change in the stem of Present tense ("ich halte"), the stem of Preterite ("ich hielt") and the stem of Past Participle ("gehalten").
Präsens
Präteritum
Futur I
Perfekt
Plusquamperfekt
Futur II
zu + Infinitiv