When Sam (arrive), we (listen) to music.
While Derek (read), Joe (watch) TV.
After Ann (get) up, she (cook) meals.
Sue (sit) for her exam the whole evening yesterday.
When I (do) my Math homework yesterday, my friend (learn) a poem.

When Sam arrived, we were listening to music

While Derek was reading, Joe watched TV

After Ann got up, she was cooking meals

Sue was sitting for her exam the whole evening yesterday

When I did my Math homework yesterday, my friend was learning a poem