Translation guide
The English word "while" has two main functions: as a conjunction meaning "during the time that" and as a conjunction meaning "although" or "in contrast." Japanese uses different structures for each, and the choice depends on whether the subject stays the same or changes, and whether the action is simultaneous or contrasting.
Expressing that two actions happen at the same time, or one action occurs within the duration of another.
Used when an action takes place during the time another action is in progress. The verb before 間に is in ている form for ongoing actions. The subject can be the same or different.
私が料理をしている間に、彼はテレビを見ていた。
While I was cooking, he was watching TV.
I'll go shopping while the kids are sleeping.
Similar to 間に, but implies taking advantage of a limited time window or doing something before a state changes. Often used for personal opportunities.
若いうちに、いろいろな国を旅行したい。
I want to travel to various countries while I'm young.
冷めないうちに食べてください。
Please eat it while it's hot.
Used when the same person does two actions simultaneously. The verb before ながら is in stem form. The main action is the second verb.
音楽を聴きながら勉強する。
I study while listening to music.
歩きながら電話しないでください。
Please don't talk on the phone while walking.
Formal/literary equivalent of ながら. Used in writing or formal speech. Same subject does two actions.
彼は成功を願いつつ、新たな事業を始めた。
While hoping for success, he started a new business.
Expressing that two facts are contrasting or that something happens despite an expectation.
Used for contrast or unexpected result. Often carries a nuance of surprise or complaint. The clause before のに is in plain form.
彼はたくさん食べるのに、全然太らない。
While he eats a lot, he doesn't gain weight at all.
このアパートは駅から遠いのに、家賃が高い。
While this apartment is far from the station, the rent is high.
Used for contrast, similar to のに but more formal/literary. Often with も for emphasis. Can be used with adjectives and nouns.
彼は若いながらも、とてもしっかりしている。
While he is young, he is very reliable.
狭いながらも楽しい我が家。
While it's small, it's a happy home.
Used to contrast two different aspects of the same situation or topic. More neutral and often used in writing.
彼は優しい一方で、厳しいところもある。
While he is kind, he also has a strict side.
この仕事は給料がいい一方で、残業が多い。
While this job pays well, there is a lot of overtime.
Similar to 一方で, but emphasizes the opposite side of the same thing. Often used for pros and cons.
インターネットは便利な反面、危険も伴う。
While the internet is convenient, it also comes with dangers.
Expressing that something continues or is valid during a certain condition or period.
Means 'as long as' or 'while' in the sense of a condition that holds. Used with verbs in dictionary form or ている form.
生きている限り、希望はある。
While there is life, there is hope.
ここにいる限り、安全だ。
While you are here, you are safe.
Literally 'during the period', used to state a condition that applies throughout that time. Often with は for contrast.
日本にいる間は、日本語を話そう。
While I'm in Japan, let's speak Japanese.
Referring to 'a while' as a length of time.
Means 'a while', 'for some time'. Used in phrases like 'for a while' or 'after a while'.
しばらくお待ちください。
Please wait for a while.
しばらくして彼は戻ってきた。
After a while, he came back.
Literally 'a short interval', used for 'a little while'.
少しの間、目を閉じてください。
Close your eyes for a little while.
Both 間に and うちに mean 'while', but うちに often implies a sense of urgency or a limited opportunity ('before it's too late'). 間に is more neutral and simply marks a time window. Use うちに when you want to emphasize doing something before a state changes.
日本にいる間に富士山に登りたい。
I want to climb Mt. Fuji while I'm in Japan. (neutral)
日本にいるうちに富士山に登りたい。
I want to climb Mt. Fuji while I'm in Japan (before I leave).
ながら can only be used when the same person does both actions. If the subjects are different, use 間に or うちに.
✕ 私が料理しながら、彼はテレビを見た。
Intended: While I cooked, he watched TV.
○ 私が料理している間に、彼はテレビを見た。
While I was cooking, he watched TV.
おっしゃることはわかりますが、賛成できません。
While I understand your point, I disagree.
Using が for contrast is natural here.