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Discover LudwigThe phrase "are lights on" is not correct in standard written English.
It can be used in a context where someone is inquiring about the status of lights, but it needs to be part of a complete sentence.
Example: "Can you check if the lights are on in the other room?"
Alternatives: "Are the lights illuminated?" or "Are the lights switched on?".
Exact(9)
That way, we can subtract points if the display is in only one color, or if there are lights on the house but not in the yard (or vice-versa).
There are lights on inside.
There are lights on the bottom of the board, and head torches are recommended.
Why are lights on in the booths, as well as behind a window curiously built into the 27-foot-long rock wall that serves as the installation's backdrop?
When I'm at home if there are lights on in a room and I'm not in it I go in to turn them off".
There also are lights on the bottom of the drone to help improve landings in low light.
Similar(51)
In another sense, the WorldCom statement is light on questions.
Details are light on this one.
Potted shrimps are lighter on the butter.
Both are light on narrative but heavy with truth.
Election campaigns are light on science.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com