Контрольные задания

Вопрос:

Фото задания: Упражнения - 3. 19. When I (to play) in the yard, I suddenly (to see) my old friend.

Фото задания

Упражнения - 3. 19. When I (to play) in the yard, I suddenly (to see) my old friend.

When I was playing in the yard, I suddenly saw my old friend.