明かりがつけっぱなしでしたよ。

明かりがつけっぱなしでしたよ。

You left your lights on.

明(あ)かりがつけっぱなしでしたよ。

Akari ga tsukeppanashi deshita yo.

明かり (あかり)

light; illumination; glow; gleam; lamp; light

が (が)

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

つけっ放し (つけっぱなし)

leaving a device on (e.g. TV, air conditioner); leaving something engaged (e.g. a key in a lock)

デス (デス)

death

よ (よ)

indicates certainty, emphasis, contempt, request, etc.; used when calling out to someone; used to catch one's breath or get someone's attention; yo!

Readings: メイ、ミョウ、ミン、あ.かり、あか.るい、あか.るむ、あか.らむ、あき.らか、あ.ける、 -あ.け、あ.く、あ.くる、あ.かす

Meanings: bright, light