A noun can name an activity
Established action nouns and nominalized infinitives are two different options. An activity noun may have additional dictionary meanings, and not every verb forms a natural noun in -ung. Learn the actual word instead of adding a suffix mechanically.
Das Lesen langer Berichte kostet Zeit.
Reading long reports takes time.
Identify the roles before rewriting
A genitive can identify what is checked, but with another noun it may name the person who acts. A durch phrase can make the actor explicit. The grammatical case alone cannot replace understanding the action noun and context.
Die Prüfung des Antrags durch Nora dauert lange.
Nora’s checking of the application takes a long time.
A full clause needs a viewpoint and a finite verb
An earlier checking event in a past account can become a nachdem clause in the pluperfect. If the original leaves the actor unknown, a passive rewrite can preserve that uncertainty. Neither style is automatically superior: choose what makes the relationship clearest.
Nachdem Nora den Antrag geprüft hatte, gab sie ihn frei.
After Nora had checked the application, she approved it.
Practise this pattern
The matching block includes guided questions, a separate mastery check and spaced review. The first 10 blocks and two samples at each higher level are free; other blocks require course access or an eligible seven-day trial. These tasks practise specific grammar patterns and do not certify a complete language level.
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References
Original explanations and examples informed by grammar references. Level placement is an editorial teaching choice.