Past Future
- I knew she would finish the task in an hour (active)
- I knew the task would be finished in an hour (passive)
Past Perfect
- Clarita had read two hundred books before graduating from the colleg (active)
- Two hundred books had been read by Clarita before graduating from the college (passive)
Past Perfect Continous
- John had been biting marry (active)
- marry had been being bitten by john (passive)
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