er nur konnte

as ... as he could

→ er
phrase Rare #44,724
as ... as he could Used in a clause with “so” (and often “wie”) to express doing something to the greatest possible degree.
GE: Er rief nach uns, so laut er nur konnte.
EN: He called out to us as loudly as he could.

Schließlich hatte Maurice sie so gründlich befragt, wie er nur konnte.

After all, Maurice had questioned her as thoroughly as he could.

So schnell er nur konnte, lief Tom die Treppe hinunter.

Tom ran down the stairs as fast as he could.

Er rief nach uns, so laut er nur konnte.

He called out to us as loudly as he could.

Dann schrie er so laut auf, wie er nur konnte, doch niemand hörte ihn.

Then he screamed as loudly as he could, but no one heard him.