Вставьте "to be" в настоящем( Present ) и прошедшем( Past Simple ) времени. Пожалуйста! Буду благодарна вам за помощь)))
1) Who .......... that boy? He ......... my friend.
2) Whose bag ......... this? Its mine.
3)My sister .......... ill last week.
4)Where ......... you yesterday? I ....... at the cinema.