Кпредложению надо задать вопросы: the girls were in the park 3 days ago,вопросы надо общий вопрос,альтернативный,опрос связый со словом who? where? how many? when
What did the girls 3 days ago ? Who were in the park 3 days ago? where were the girls 3 days ago? how many days ago the girls were in the park? when were the girls in the park?
