Найдите и исправьте ошибки в предложениях. 1. is she a student or a worker? 2. they were listening to him with great attention. 3. the cats were sitting in the sun. 4. can you play on the piano?

1)  Is she a student or worker? - при альтернативном вопросе после союза или можно опустить артикль

2) They were listening to him with great attention. - не нахожу ошибку - Они слушали его с огромным вниманием.

3) The cats were sitting in the sun. - хотя возможен и второй вариант "under the sun"

4) Can you play the piano? - после глагола to play предлоги не употребляются