て以来
(Te irai)
Indicates that a certain state has continued since a specific event in the past occurred.
Connection rules
- +Verb (て-form) + 以来
Examples
1.
日本に来て以来、毎日納豆を食べている。

Nippon ni ki te irai, mainichi nattou wo tabe te iru.
Since coming to Japan, I have been eating natto every day.
「Life in Japan」
2.
卒業して以来、彼とは一度も会っていない。

Sotsugyou shi te irai, kare to ha ichi do mo a te i nai.
Since graduating, I haven't met him even once.
「Old friends」
Practice
Since graduating from university, I haven't seen him once.
大学を___、彼には一度も会っていない。
Romaji also accepted