窓mado　[が]　開aけて　ある。

窓まど　が　開あけて　ある。mado ga akete aru.

The window has been opened (by someone, and is still open).

mado ga akete aru.

Breakdown of mado ga akete aru.

subject particle

開あけるakeru

to open^transitive

〜て　ある〜te aru

grammar indicating remaining state intentionally brought about by someone

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Nihon-shiki romanizationwatasi ha tyuugoku kara kimasita Hepburn romanizationwatashi wa chuugoku kara kimashita