つつ and ながら can both mean “while”; つつある means a process or change is under way. 音楽を聞きながら is natural conversation; 聞きつつ is more literary. 改善しつつある reports ongoing improvement, often in formal writing. つつも and ながらも can also introduce a contrast, as in 知りつつもやめられない.
also written tsutsu / tsutsuaru / nagara / つつも
つつ — while doing, in writing · つつある — in the middle of changing · ながら — while doing, in speech
Sentences
6 sentences, word by word
つつ · the written 'while'
plain
。
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音楽
おんがく ［1］
music
noun · the object of 聞く
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を
を
marks the direct object
particle · pronounced お
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聞きつつ
ききつつ
while listening
ます-stem of 聞く ＋ つつ · the written twin of ながら
つつN2while — written
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勉強
べんきょう ［0］
study
noun · made a verb by する
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を
を
marks the direct object
particle · pronounced お
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する
する
do
irregular verb · the main action, which つつ attaches around
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I study while listening to music.
つつある · a change under way
polite
。
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状況
じょうきょう ［0］
situation
noun · the thing undergoing the change
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は
は
as for — the topic
particle · written は, read わ
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改善しつつあります
かいぜんしつつあります
is improving
改善する ＋ つつある · a change in progress, not an activity
つつあるN2in the middle of changing
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The situation is improving.
ながら · the spoken 'while'
plain
。
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テレビ
テレビ
television
noun · loanword, clipped from テレビジョン
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を
を
marks the direct object
particle · pronounced お
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見ながら
みながら
while watching
ます-stem of 見る ＋ ながら · the everyday spoken form
ながらN2while — spoken
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食べる
たべる ［2］
to eat
ichidan verb · 食べます／食べた
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I eat while watching television.
つつある · the economy
polite
。
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経済
けいざい ［1］
economy
noun · the subject of the recovery
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は
は
as for — the topic
particle · written は, read わ
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回復しつつあります
かいふくしつつあります
is recovering
回復する ＋ つつある · the register where this pattern actually lives
つつあるN2is in the process of
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The economy is recovering.
つつも · knowing and doing anyway
plain
、。
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悪い
わるい ［2］
wrong; bad
い-adjective · the content of the knowing
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と
と
with; and
particle · joins nouns, or marks who you did it with
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知りつつも
しりつつも
even knowing
ます-stem of 知る ＋ つつも · the も turns it into a concession
つつもN2even while
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やめられない
やめられない
can't stop
negative potential of やめる · the thing that continues regardless
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I know it's wrong, and I still can't stop.
The one that doesn't work
plain
。
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時代
じだい ［0］
the times
noun · an era, and the thing that changes
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は
は
as for — the topic
particle · written は, read わ
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少しずつ
すこしずつ ［4］
little by little
adverb · 少し ＋ ずつ, the gradualness つつある wants
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変わりつつある
かわりつつある
is changing
ます-stem of 変わる ＋ つつある · a change verb, which is the requirement
つつあるN2is changing
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Times are gradually changing.
Structure
The three shapes
聞き / 思い＋つつ
音楽を聞きつつ. Same slot as ながら, different register — this one is for essays and reports.
改善し / 回復し＋つつある
改善しつつある. Needs a verb of change — 変わる, 増える, 減る, 回復する. Not an activity.
見 / 歩き＋ながら
テレビを見ながら. The spoken default, and the one to reach for when talking.
知り＋つつも / ながらも
悪いと知りつつも. Adding も turns simultaneity into concession — knowing full well, and doing it anyway.
Meaning
Why つつある is the odd one out
つつ and ながら are register twins. Both attach to the ます-stem and both mean two things happening at once. つつ belongs to writing; ながら to speech. Swapping them is a register slip, not a meaning error.
つつある describes a change mid-flight.状況は改善しつつある — the situation is improving, right now, not yet improved. It is closest to English "is becoming," and it has nothing to do with doing two things at once.
つつある commonly describes a developing change.変わりつつある, 増えつつある, and 回復しつつある are natural. 食べつつある is unusual for ordinary eating; use 食べている for “in the middle of eating.”
Adding も can express concession.悪いと知りつつも、やめられない means continuing despite knowing it is wrong. ながらも can convey a similar contrast, though the two are not interchangeable in every sentence.
Watch out
Where these three go wrong
Treating つつある as a variant of つつ
They are different patterns. 聞きつつ is while listening; 改善しつつある is in the middle of improving. Adding ある changes the meaning completely.
Putting an activity verb in つつある
食べつつある is unusual for ordinary eating. つつある is especially common with developing changes such as 変わる, 増える, and 回復する. Use 食べている for everyday ongoing eating.
Saying つつ out loud
It is grammatical and it sounds like reading a report aloud. In conversation ながら is the form; keep つつ for what you write.
Using ながら for two unrelated subjects
Both halves must share a subject. 私が音楽を聞きながら、彼が料理した does not work — for two different people, use 間に.
Also asked
Questions people ask about つつ and ながら
Are つつ and ながら interchangeable?
In meaning, yes — both attach to the ます-stem and mark two things at once. The difference is register: つつ is written, ながら is spoken.
What exactly does つつある add?
It says a change is under way and unfinished. 改善した is improved; 改善しつつある is improving. English "is becoming" is the closest fit.
つつある or ている?
ている covers both ongoing activity and resulting state, so it is broader. つつある is narrower and more formal, and it insists the change is still moving.
What does the も in つつも do?
ながらも can convey a similar concession, though the two forms are not interchangeable in every sentence.
References
Sources and usage notes
Nihon Kokugo Daijiten: つつ — Documents simultaneous and ongoing uses and the stronger written register of つつ.
