I don't know

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I don't know   
Collins Multilingual Translator © HarperCollins Publishers 2009
References in classic literature ?
"Well, I don't know. But per'aps if we keep them till they're ransomed, it means that we keep them till they're dead.
"I don't know which is the dinkier," she observed finally, "--owning a few little acres and the team you're driving, or not owning any acres and driving a team somebody else owns for wages."
"We'd like to believe human trials could start within a year," he says, "but I don't know that as a fact."
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