Usage patterns
〈時〉以来ever since 〈time〉
I haven't seen him since last summer.
〈動詞〉て以来ever since (doing something)
Ever since I joined this company, my days have been busy.
〈事〉以来ever since 〈event〉
Ever since that incident, the town's atmosphere has changed.
Expressions
それ以来since then; ever since; from that time その時以来since that time; since then; from that point on