Explanation
Indicates something happening 'since', 'ever since', or 'after' a particular time.
Formation
Verb-past + 以来, い-Adjective + 以来, Noun + 以来
Detailed explanation
The ～以来 grammar point is used to express a period of time that has continued uninterrupted since a certain point in the past. It can be translated as 'since', 'ever since', or 'after'. The formation differs depending on whether it is used with a verb, an adjective, or a noun.
Examples
Sotsugyou irai, kanojo ni atte inai.
I haven't seen her since we graduated.
Kodomo ga umarete irai, isogashiku natta.
I've been busy ever since my child was born.
Toukyou ni hikkoshite irai, tomodachi ga fueta.
I've made more friends since I moved to Tokyo.
Ano eiga wo mita irai, kanojo wa kowagari ni natta.
She's been easily frightened ever since she watched that movie.
Practice
Grammar content sourced from hanabira.org.