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Discover LudwigThe phrase "be fast" is correct and usable in written English.
It can be used to encourage someone to act quickly or to emphasize the need for speed in a particular situation.
Example: "In order to meet the deadline, you need to be fast in completing your tasks."
Alternatives: "hurry up" or "act quickly."
Dictionary
Exact(58)
It will be fast.
Responses can be fast.
It has to be fast.
"If they [Nusakambangan] can be fast, we'll be fast too".
To succeed, websites need to be fast.
"Anybody can be fast doing Mamet.
You gotta be fast with your hands.
Any N router will be fast enough.
"I want to be fast," he said.
Similar(2)
When switching be fast and swift.
"You'd be fast-forwarding the clock".
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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