窓は

as for the window(s)

→ 窓
phrase Uncommon #9,257
as for the window(s) 窓 means “window,” and は marks it as the topic. In natural English, は is often not translated explicitly.
JA: 窓は開けないでください。
EN: Please don't open the window.

窓は全部閉まってる

Are all the windows closed?

どういうふうにこの窓は割れた

How did this window get broken?

窓は開いてる

Is the window open?

窓は開けない方がいいと思うよ

I think it would be better not to open the window.

— ハウルの動く城 (2004)

二階窓は閉めた

I closed the upstairs window.

この窓は一ヶ月割れたままになっている

This window has been broken for a month.

このボタンを押すと窓は自動開きます

When you press this button, the window opens automatically.

窓はやめてくれ

Leave the window alone.

— イングリッシュ・ペイシェント (1996)

窓は外側開いた

The window opened outward.

この窓は誰に壊されたのですか

Who broke this window?

窓は全部かかってる

Are all the windows locked?

トム窓は空いていた

Tom's window was open.

窓は開けないでください

Please don't open the window.

部屋の窓は閉めておくように

Make sure to keep the room windows closed.

この窓はどうしても閉まらない

This window just won't close.

窓は全部閉めた

Did you close all the windows?

この窓は南向きです

This window faces south.

窓は両方とも壊れていました

Both windows were broken.

窓は閉まってた

Was the window closed?

窓は開けっ放ししないでちょうだい

Please don't leave the window open.