がてら
"While doing X, also do Y" or "do Y, which doubles as X." It links two activities so that one outing or action serves two purposes at once.
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Used when one activity is combined with, or doubles as, a second purpose. The main clause often contains a movement verb such as 行く, 来る or 立ち寄る, though overlapping actions also work (運動がてら掃除をする). Unlike ながら, which simply pairs two concurrent actions, がてら stresses that one activity serves two ends. It is somewhat bookish but common in everyday speech, especially with 散歩 or 買い物.
Do not use がてら for merely concurrent, unrelated actions like listening to music while studying; use ながら unless one action serves another purpose.
Note that the main clause often involves going somewhere or dropping by, but this is a strong tendency rather than a strict rule.
Learners should attach がてら only to action nouns or verb stems, not to nouns that do not express an activity.
- かたがたN1「かたがた」 also expresses achieving two purposes at once, but it attaches only to nouns, not the ます-form, and carries a formal tone often used in letters—for visits combining greetings such as 「お礼かたがた伺う」. With everyday nouns like 「散歩」 both work, but for formal social calls prefer 「かたがた」.
- ついでにN3「ついでに」 also means 'while you're at it,' but emphasizes the first item as primary and the second as incidental. It has broader attachments—dictionary-form verbs, ta-form verbs, and noun + の—and can even stand alone as an adverb. In sentences about outings like walks or shopping, the two are mostly interchangeable.
- かたわらN1「かたわら」 refers to doing something on a long-term basis alongside your main job or activity, has a strong literary flavor, and requires の when attaching to a noun. 「がてら」, by contrast, means doing something incidentally through a single occasion, attaching directly to nouns—the two cannot be swapped.
- ながら / いながら / ながらもN3「ながら」 resembles 「がてら」 only when expressing simultaneous actions: it describes two actions happening in parallel with emphasis on the latter clause, whereas 「がてら」 uses the former action as an opening to casually do the latter, typically on outings. Since 「ながら」 also has a concessive meaning, the two generally cannot replace each other.
かたがた is more formal and usually follows set nouns like お礼 or ご挨拶 in letters and business contexts, while ついでに is broader and more casual for any incidental extra action. かたわら describes a long-term side activity alongside one's main occupation, and ながら simply marks two actions done at the same time by the same person without the sense of one activity serving two purposes.
