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.
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.
I want to travel to various countries while I'm young.
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.
I study while listening to music.
Formal/literary equivalent of ながら. Used in writing or formal speech. Same subject does two actions.
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.
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.
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'.
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.
I want to climb Mt. Fuji while I'm in Japan. (neutral)
While I understand your point, I disagree.
Using が for contrast is natural here.
Please eat it while it's hot.
歩きながら電話しないでください。
Please don't talk on the phone while walking.
While hoping for success, he started a new business.
While he eats a lot, he doesn't gain weight at all.
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.
While he is young, he is very reliable.
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.
While he is kind, he also has a strict side.
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.
While the internet is convenient, it also comes with dangers.
While there is life, there is hope.
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.
While I'm in Japan, let's speak Japanese.
Please wait for a while.
After a while, he came back.
Literally 'a short interval', used for 'a little while'.
Close your eyes for a little while.
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.
Intended: While I cooked, he watched TV.
While I was cooking, he watched TV.
Strike while the iron is hot.
Proverb using うちに.