*On a separate sheet of paper, rewrite the sentenoes with perfect modals in the active voice.
1. Scientists believe that (it's possible some form of life existed) on the planet Mars billions of years ago
Ex: Scientists believe that some form of life could have existed on the planet Mars billions of years ago
2. Heyerdahl thought (it was possible that they had come) on a raft like the Kon-Tiki.
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3. Some historians think that (the Rapa Nui islanders probably didn't move) the moai using logs.
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4. (It's possible someone forced the pilot) to fly the plane to a different location.
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5. Experts suggest that originally (the Ropa Nul people most likely wrote) on banana leaves
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6. (There's no question that hunting was) the cause of the carrier pigeon's extinction as a species.
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