〜て以来
JLPT N2 Time and sequenceever since
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て以来 means that ever since a past event, a state has continued unchanged up to now. Attach it to a verb's te-form. The situation it describes is ongoing and has not been interrupted since that point.
Examples
にて、。 Nihon ni kite irai, mainichi isogashii.
Ever since I came to Japan, I've been busy every day.
て、にてない。 Sotsugyou shite irai, kare ni atte inai.
I haven't seen him since I graduated.