Well, I should mention that there are other remnants of the cases in Bulgarian, for instance the definite suffix of masculine nouns has two forms - nominative and 'oblique' as many linguists call it. Here's a dull example that illustrates that:
Учителят е в стаята.
The teacher is in the room.
I see the teacher.
As you see, in the first sentence the teacher is the subject so it takes the nominative form -ят while in the second sentence the teacher is the direct object so it takes the so called 'oblique' form -я. However, many Bulgarians don't mark this difference while speaking or writing.
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