проверьте, пожалуйста, может стоит какие слова убрать либо добавить? 1.

проверьте, пожалуйста, может стоит какие слова убрать либо добавить?
1. a) She is still studying Spanish. b) She has been studying Spanish for two years. 2. a) They are still living in the country. b) They have a been living in the country for four months. 3. a) She is still speaking on the phone. b) She has been speaking on the phone for twenty minutes. 4. a) My brother is still solving this difficult problem. b) He has been solving this problem for half an hour. 5. a) She is still writing a letter to her grandmother. b) She has been writing this letter for an hour. 6. a) They are still fishing. b) They have been fishing for five hours already. 7. a) My grandparents are still playing lotto. b) They have been playing lotto for two hours already. 8. a) They are still arguing. b) They have been arguing for two hours already. 9. a) She is still sleeping. b) She has been sleeping for two hours. 10. a) He is still doing his homework. b) He has been doing his homework for three hours already. 11. a) The boys are still playing football. b) They have been playing football for forty minutes. 12. a) The girls are still changing their clothes. b) They have been changing their clothes for half an hour.