Translate into German — the point is the relative pronoun. Good for opinion texts.
Translate each sentence into German, using the German words given after the dash. Only the relative pronoun is checked — with its preposition, straight after the comma (…, mit denen …) — so keep that comma. The model is shown afterwards to compare the rest.
English often drops 'who' or leaves the preposition at the end: 'the friend I helped', 'the child I gave it to'. German always needs the pronoun, and the verb decides the case.
People to whom the environment matters often cycle. — die Menschen · die Umwelt · wichtig sein + Dativ · Rad fahren
The country that is short of water has big problems. — das Land · das Wasser · fehlen + Dativ
The mayor we handed the petition to has responded. — der Bürgermeister · die Petition · übergeben
The young people who are worried about the future go and demonstrate. — die Jugendlichen · die Zukunft · Sorgen machen + Dativ
The government that many people don't trust wants to build more cycle paths. — die Regierung · vertrauen + Dativ · die Radwege
The trees that the heat is harming need water. — die Bäume · die Hitze · schaden + Dativ
'The flat I live in' → die Wohnung, in der ich wohne. The preposition moves to the front of the clause.
The problems the cities are struggling with are big. — die Probleme · die Städte · kämpfen mit
The society we live in is changing fast. — die Gesellschaft · sich verändern
The problem everyone is talking about is climate change. — das Problem · sprechen von · der Klimawandel
The countries where it hardly rains need help. — die Länder · die Hilfe
The rubbish we have to do something about is lying everywhere. — der Müll · etwas tun gegen
The association I volunteer with helps refugees. — der Verein · sich engagieren bei · die Flüchtlinge
'whose' → dessen (masculine, neuter) or deren (feminine, plural).
The city whose air is so bad is planning a low-emission zone. — die Stadt · die Luft · die Umweltzone
Families whose income is low get support. — die Familien · das Einkommen · die Unterstützung
The river whose water is polluted is being cleaned. — der Fluss · das Wasser · verschmutzt
The company whose factory pollutes the air has to pay. — das Unternehmen · die Fabrik
The government, whose plans are controversial, wants to build more cycle paths. — die Regierung · die Pläne · umstritten
The citizens whose taxes pay for the projects want a say. — die Bürger · die Steuern · mitreden
All the cases mixed. Work out what the pronoun does in its own clause before you write it.
The campaign that raises public awareness is successful. — die Kampagne · das Bewusstsein der Öffentlichkeit schärfen
The campaign the government launched is successful. — die Kampagne · die Regierung · starten
The trees whose leaves are turning yellow are sick. — die Bäume · die Blätter
The suggestion you made is good. — der Vorschlag · machen
The proposal whose costs nobody knows is being discussed. — der Vorschlag · die Kosten
The people I spoke to are against it. — die Menschen · sprechen mit · dagegen sein