て以来 (te irai): Ever since an event
～て以来 (te irai)
Meaning
Ever since an event
Formation and usage
Te-form verb + 以来, followed by a continuing state or repeated habit. Noun + 以来 is also possible.
Explanation
Use an event as the starting point of a state or habit that continues until now or a stated reference time. The second clause should express continuation or repetition, not just an isolated action immediately afterward.
Examples
日本に来て以来、毎日電車で通勤しています。
Ever since coming to Japan, I have commuted by train every day.
あの映画を見て以来、この監督の作品が好きです。
Ever since seeing that film, I have liked this director's work.
引っ越して以来、近所を散歩するのが習慣になりました。
Since moving, walking around the neighborhood has become a habit.
一度けがをして以来、運動前には必ず準備運動をしています。
Ever since an injury, I have always warmed up before exercising.
彼とは卒業して以来、ずっと連絡を取り合っています。
He and I have kept in touch ever since graduation.
How related patterns differ
まま emphasizes an unchanged state. うちに focuses on an opportunity or a change during a period; ないうちに means before an event occurs. て以来 marks the starting event of a continuing state.