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The phrase "knew to" is not grammatically correct
The correct phrase would be "knew how to." For example: She knew how to fix the problem.
Exact(55)
The Cherokee knew to stay away.
Everyone knew to whom Gergiev was referring.
Close friends knew to leave her alone.
C. C. knew to take them bleeps".
"They knew to leave them alone.
Columbia students knew to avoid it.
Even your dog knew to keep quiet.
The rest knew to follow.
I'd exhausted everything I knew to improve".
SUZANNE SOMERS knew to keep them waiting.
"However, I knew to keep them.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com