Breakdown of Meine Mitbewohnerin erzählt mir abends immer etwas Interessantes aus ihrem Studium.
Questions & Answers about Meine Mitbewohnerin erzählt mir abends immer etwas Interessantes aus ihrem Studium.
Mein / meine is a possessive determiner that changes with gender, number and case.
- Mitbewohnerin is grammatically feminine (ending -in usually marks feminine people).
- It is the subject of the sentence, so it’s in the nominative case.
- Feminine nominative with mein- takes the ending -e → meine Mitbewohnerin.
Comparison (nominative singular):
- mein Mitbewohner (my male flatmate – masculine)
- meine Mitbewohnerin (my female flatmate – feminine)
- mein Studium (my degree course – neuter)
Mitbewohnerin is a compound noun:
- mit = with
- Bewohner = inhabitant
- Mitbewohner = person you live with (flatmate/roommate), usually male or gender‑neutral in colloquial use
- Mitbewohnerin = explicitly a female flatmate/roommate (the -in marks feminine).
- die Mitbewohner (mixed group or all male)
- die Mitbewohnerinnen (all female)
In your sentence, the person is explicitly female, hence Mitbewohnerin.