Questions & Answers about Лікар оглянув щелепу.
Because it is the direct object of the verb оглянув.
The dictionary form is щелепа. In this sentence, the doctor examined the jaw, so jaw is the thing receiving the action. In Ukrainian, a feminine noun ending in -а usually changes to -у in the accusative singular:
- щелепа = nominative singular
- щелепу = accusative singular
So:
- Лікар = the doctor
- оглянув = examined
- щелепу = the jaw
Оглянув is the past tense, masculine singular form of the verb оглянути.
It tells you that:
- the action happened in the past
- the subject is singular
- the subject is grammatically masculine
Related forms would be:
- оглянув = he examined
- оглянула = she examined
- оглянуло = it examined
- оглянули = they examined
So this sentence specifically sounds like the doctor is male, unless context overrides that in some unusual way.