Meaning & usage
以来 marks a past starting point and describes a state or action that has continued from then until now. It follows a time or event noun, as in クリスマス以来, or a verb in the past ta-form, as in ダイエットして以来. Set phrases like それ以来 and その時以来 are common for referring back to a previously mentioned event. It often pairs with ずっと to stress continuity.
Example sentences 5
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ダイエットして以来、彼女はずいぶん体重が減った。
She's lost a lot of weight since she went on a diet.
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私はそれ以来ずっと彼の世話をしている。
I have been taking care of him ever since.
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先週の土曜日以来ずっと雨です。
It has been raining since last Saturday.
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クリスマス以来、ずいぶん太ってしまった。
I've put on a lot of weight since Christmas.
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私はその時以来彼にあっていない。
I have not seen him since then.
In past JLPT papers
This came up in 4 past exam questions.