Ответ:

When Mary came to the dining room she took off her coat and sat down. The waitress soon brought her some soup. When Mary finished her dinner she looked at her watch, put on her coat and went out. (Say the same about Peter): When Peter came to the dining room he took off his coat and sat down. The waitress soon brought him some soup. When Peter finished his dinner he looked at his watch, put on his coat and went out. (Now Mary speaks about herself): "When I came to the dining room I took off my coat and sat down. The waitress soon brought me some soup. When I finished my dinner I looked at my watch, put on my coat and went out." (Now Mary and Peter tell us what they did in the dining room when they went their together): "When we came to the dining room we took off our coats and sat down. The waitress soon brought us some soup. When we finished our dinner we looked at our watches, put on our coats and went out."

Объяснение:

Обрати внимание, что в третьей части задания существительные изменяем на мн.ч. (coats/watches)