～たびに
Whenever...
Structure
Nの／Vる＋たびに
Explanation
Expresses that whenever A occurs, B always occurs (a repeated or regular pattern); the following clause is usually a result/reaction and typically not in the past tense.
Examples
1バーゲンセールのたびに、ついいらないものも買ってしまう。
Every time there's a bargain sale, I end up buying things I don't need.
2父は旅行のたびに、その土地の名産品をおみやげに買ってきてくれる。
Whenever my father travels, he brings back local specialties as souvenirs.
3辞書を引くたびに新しい発見がある。
Every time I look something up in a dictionary, I discover something new.
4友人たちの活躍を聞くたびに、うれしく思う。
I'm happy whenever I hear about my friends' successes.
Note
1) Easily confused with ～とき／～たら.
→ ～たびに means 'whenever...then...', indicating a repeated, habitual occurrence.2) The following clause is usually a repeated reaction/result.
→ Generally not used to describe a single occurrence.3) Avoid using it for an event that happened only once.
→ If it's just 'after...' (sequence in time), use a different pattern.