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Discover LudwigSuggestions(5)
"how cool" is correct and can be used in written English.
You could use it to express admiration for a person, thing, or situation. For example, "That video game you designed is amazing - how cool!".
Exact(60)
How cool.
"How cool," she said.
"How cool is that?
How cool is this!
"How cool," he said.
How cool was that?
Tridiv How cool is this?
"Look how cool he is.
How cool would that be?
How cool would it be?
That's how cool they are.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com