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窓は開けた

opened the window

→ 窓
phrase Rare #39,423
opened the window は marks 窓 (window) as the topic. 開けた is the past form of 開ける, meaning to open something.
JA: 窓は開けたけど、まだ暑い。
EN: I opened the window, but it’s still hot.

窓は開けた方がいい？

Should I open the window?

窓は開けたままでお願いします。

Please leave the window open.

二階の窓は開けたよ。

I opened the second-floor window.