A2
ながら — while doing
How ながら joins simultaneous actions in Japanese, which of the two it attaches to, and why both must share a subject.
Drop ます, add ながら. The action it attaches to is the background one; the main action comes at the end.
音楽を聞きながら勉強します。
Ongaku o kikinagara benkyō shimasu.
I study while listening to music.
歩きながら電話しないでください。
Arukinagara denwa shinaide kudasai.
Please don’t use your phone while walking.
Which verb takes ながら decides which action the sentence is about. 聞きながら勉強 します is studying, with music on. 勉強しながら聞きます is listening, while studying — a different sentence.
One person, both actions
ながら requires the same subject throughout. Two people doing things at once needs a different construction.
妹が歌いながら、私は料理しました。
妹が歌っている間、私は料理しました。
ながら joins two actions by one person. For two subjects the word is 間 (while), which takes a clause in front of it as a noun does.
Not for background states
The two actions have to be genuine activities. A continuing state uses ている or 間 instead.
日本に住んでいる間、たくさん旅行しました。
Nihon ni sunde iru aida, takusan ryokō shimashita.
While I was living in Japan, I travelled a lot.
A second sense — although
With a state rather than an action in front of it, ながら can mean even though. It is more literary, and worth recognising rather than using.
残念ながら、行けません。
Zannen nagara, ikemasen.
Regrettably, I can’t go.
残念ながら is fixed and extremely common — a set phrase for delivering bad news politely, and most learners meet it long before they meet the grammar behind it.