出门前检查下煤气是否关闭。翻译

出门前检查下煤气是否关闭
You should check if the gas is turned off before you leave.

出门前检查下煤气是否关闭

Check the gas valve for tightness before you go out.

Check on whether the gas has been closed before going out

You should check whether the gas is off before you're out.

You should check whether the gas is off before you go out.

You should check whether the gas is closed or not before you get out.