Questions & Answers about Ich massiere meinen Rücken langsam.
Because Rücken is the direct object of the verb massieren, it has to be in the accusative case.
- mein Rücken = nominative (subject form)
- meinen Rücken = accusative (direct object form)
The possessive pronoun mein- declines like this for masculine singular:
- Nominative: mein Rücken (subject)
- Accusative: meinen Rücken (direct object)
- Dative: meinem Rücken
- Genitive: meines Rückens
In the sentence Ich massiere meinen Rücken langsam, ich is the subject (nominative), meinen Rücken is the thing being massaged (accusative), so we must use meinen.