How do I know if a sentence is in the active or passive voice?

Remember: If the subject is performing the action, then the sentence is in active voice. If the subject is simply receiving the action, then the sentence is in passive voice. Shift the object of the action into the beginning of the sentence.  

Example:

You did not pay your bill.

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explanation:

sugar had three basic uses in ancient india. it was used in religious rites, consumed as a snack, and was considered a kind of medicine.

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