1. Are she playing the guitar in her room? - Correct: Is she playing the guitar in her room?
2. Is he visits his grandma right now? - Correct: Is he visiting his grandma right now?
3. Do seagulls crying above the Black Sea? - Correct: Are seagulls crying above the Black Sea?
4. Am Maria brushing her teeth now? - Correct: Is Maria brushing her teeth now?
5. What am I do here? - Correct: What am I doing here?
6. They aren't go to the party? - Correct: They aren't going to the party.