> Cf with "Schwebeablaut"
> *swedh- (Eng. ppp swidden)
> *sewdh- Eng seethe
> Basque su- "fire"
If you want an example in English of the so-called "schwebeablaut", how
about
wreak/wrought ~ work
That this could be inherited is more likely, since it occurs also in Greek:
*(w)reg-io > rezo ~ (w)ergon)