Yūbinkyoku ni iku tsuide ni, kono tegami o dashite kite kuremasen ka.

While you are going to the post office, could you mail this letter for me?

Shucchō no tsuide ni, Kyōto ni aru furui otera o kankō shita.

While on a business trip, I took the opportunity to sightsee at some old temples in Kyoto.

Heya o sōji shita tsuide ni, tsukue no hikidashi no naka mo seiri shita.

While cleaning my room, I took the opportunity to organize the inside of my desk drawers as well.

Sūpā e kaimono ni itte kimasu. Tsuide ni gyūnyū mo katte kimashō ka.

I'm going to the supermarket to shop. While I'm at it, shall I buy some milk too?

Toshokan ni hon o kaeshi ni iku tsuide ni, atarashii shōsetsu o karita.

While going to the library to return a book, I took the opportunity to borrow a new novel.

Sanpo no tsuide ni, chikaku no konbini de kōkyō ryōkin o shiharatta.

While out for a walk, I paid my utility bills at a nearby convenience store.