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Discover LudwigThe phrase "promise that" is grammatically correct and is commonly used in written English.
It typically introduces a promise or commitment that someone is making in the sentence. Example: "I promise that I will always be there for you, no matter what."
Exact(58)
I promise that".
"I promise that personally, this is my own connection and I personally promise that.
I promise that isn't the case.
Google promise that "whitelisting" is coming soon.
It was a promise that Redgrave broke.
"We can't promise that," Mae said.
"But don't promise that," he says.
"As your leaders, we promise that will never change".
"We believe that's a promise that is unfulfilled," he said.
A block away, university officials promise that could change.
I made them promise that last one.
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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