Packing Information Before the Noun
In English, long descriptive phrases usually go after the noun: The species [threatened by the poacher]. In formal written Swedish, you can pack this entire description before the noun.
Think of the whole phrase as one giant adjective sitting between the article and the noun. Because it acts as an adjective in a definite phrase, the participle at the end (like hotade, threatened) takes the definite -a ending.
| We must protect the species threatened by the poacher. | Vi måste skydda den av tjuvskytten hotade arten. |
Notice the word order: Article (den) + Modifier (av tjuvskytten) + Participle (hotade) + Noun (arten). This works exactly the same for ett words and plurals:
| The water polluted by the emission is dangerous. | Det av utsläppet förorenade vattnet är farligt. |
| The researcher studies the animals affected by the climate change. | Forskaren studerar de av klimatförändringen drabbade djuren. |
Indefinite Nouns
With indefinite nouns, the participle must agree with the noun's gender, just like a standard adjective.
For indefinite ett words, the participle takes a -t ending:
| One must not visit a nature reserve monitored by the police. | Man får inte besöka ett av polisen övervakat naturreservat. |
For indefinite en words, the participle stays in its base form:
| The government wants to save an almost completely eradicated species. | Regeringen vill rädda en nästan helt utrotad art. |
Adverbs and Possessives
The modifier space isn't limited to "by [someone]." You can include adverbs to describe how something is affected, or swap the initial article for a possessive pronoun like deras (their):
| Their cabin destroyed by the storm is completely empty now. | Deras av stormen förstörda stuga är helt tom nu. |
| We must protect the species severely affected by climate change. | Vi måste skydda den av klimatförändringen svårt drabbade arten. |
