～たびに
every time / each time
～たびに says that whenever one thing happens, another thing happens along with it. It comes from the noun 度（たび）, meaning “occasion” or “time”, and attaches to the dictionary form of a verb or to a noun + の.
It maps to English “every time ...” or “whenever ...”, and it describes things that really do repeat, not hypothetical conditions.
1. Verb dictionary form + たびに
The verb stays in the dictionary form even when the sentence is about the past, because たびに describes the occasion itself, not when it happened.
会うたびに笑顔になる。
“Every time we meet, I smile.”
- 会う（あう）= to meet
- たびに = every time
- 笑顔（えがお）= smile, smiling face
- に = marks the result of the change
- なる = to become
2. Noun + のたびに
With a noun that names an event or occasion, link it with の.
旅行のたびに、お土産を買う。
“Every time I travel, I buy souvenirs.”
- 旅行（りょこう）= trip, travel
- の = links the noun to たびに
- たびに = every time
- お土産（おみやげ）= souvenir
- を = object marker
- 買う（かう）= to buy
How to form it
Verb dictionary form + たびに / Noun + のたびに
- 会う（あう）= to meet → 会うたびに（あうたびに）= every time (we) meet
- 聞く（きく）= to hear → 聞くたびに（きくたびに）= every time (I) hear it
- 旅行（りょこう）= trip → 旅行のたびに（りょこうのたびに）= every time (I) travel
Key idea
Since たび literally means “occasion”, X たびに Y means “on every occasion of X, Y”. The two events repeat together, without exception.
Other N3 grammar
Updated .