Diachronic and synchronic corpus study of Oberfeld position in German.
10">In contemporary German, the Oberfeld position of werden is restricted to modal verbs.
15">Gradual diachronic change from Oberfeld werden to clause-final position for non-modal verbs.
Zwischenstellung in the verbal complex is attested from 1610 to 2000.
Zwischenstellung is neither archaic, nor restricted to regional varieties of German.