-nagara ( Genki II Chapter 18)

~ながら

You can connect two verbs with ながら to say that the two actions are preformed at the same time. ながら follows a verb stem. The second, which goes after ながら, can be in any form.

わたしはいつもおんがくをききながらにほんごをべんきょうします。

I always study Japanese while listening to music.

たけしさんはうたをうたいながらせんたくをしています。

Takeshi is doing laundry singing a song.

Note the two verbs must be preformed by the same person.