Questions & Answers about Lekar pregleda pacijenta.
Serbian normally does not use articles. So lekar can mean a doctor or the doctor, and pacijenta can mean a patient or the patient.
Context tells you which meaning is intended. That is very common in Serbian.
Because it is the direct object of the verb, so it is in the accusative case.
The basic form is pacijent.
In this sentence, the doctor examines the patient, so patient is the thing/person being examined. That makes it a direct object.
For many masculine animate nouns in Serbian, the accusative singular ends in -a:
- pacijent → pacijenta
- student → studenta
- lekar → lekara (if it were the object)
So the ending -a here does not mean the noun is feminine. It is just a case ending.
Because lekar is the subject of the sentence, and subjects normally appear in the nominative case.