Form the participle, then add the adjective ending
Partizip I normally adds d to the infinitive. The article, gender, number and case then determine the adjective ending. A participle inside a verb construction does not acquire an adjective ending merely because the same form can describe a noun.
Die wartenden Gäste stehen draußen.
The waiting guests are standing outside.
Past participle does not always mean passive
Checked documents are affected by someone’s checking. Arrived guests themselves performed the arrival. The useful active-versus-affected contrast works well with transitive verbs, but it is not a universal definition of Partizip II.
Die angekommenen Gäste warten im Flur.
The guests who have arrived are waiting in the corridor.
Unpack a long attribute with a relative clause
Time phrases and an agent can belong to the description between article and noun. A relative clause can make that dense information easier to follow. Preserve who did what and choose a tense appropriate to the wider context.
Der gestern geprüfte Antrag ist vollständig.
The application checked yesterday is complete.
Practise this pattern
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References
Original explanations and examples informed by grammar references. Level placement is an editorial teaching choice.