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Discover LudwigThe phrase "must be running" is grammatically correct and can be used in written English.
You can use it as a modal verb phrase to express the idea of obligation or necessity. It implies that something is required or necessary to happen in the present or future. Example: "The car must be running smoothly if we want to make it to our destination on time."
Exact(60)
The PaperCut client must be running when you print.
The clicks on these stories must be running high.
She must be running on adrenaline alone now she's finished".
A squirrel must be running across the roof.
One step was missing: the machine must be running.
To use referrals, clients must be running MIT krb5 1.6 or later, and the KDC must be running MIT krb5 1.7 or later.
Somewhere, the current must be running in a more helpful direction.
I was looking at your eyes thinking, What must be running through this man's head?
To use FileVault 2 computers must be running Mac OS 10.7 or higher.
Therefore, Mr. Cheney must be running the country from under Mr. Bush's Oval Office desk.
You must be running a browser that supports the Service Worker and fetch APIs.
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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