"We know it to be a drug"
Here, what does it mean by "to be" in this sentence? I know that it is a active infinitive sentence. But my question is what is the full form of "to be" here? If you say the full form of "to be" in this sentence is "is" then if I replace "to be" by "is", it will make no sense like:
"We know it is a drug"
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