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The Easter Island statues are huge. It (take) a long time to carve one.
must have taken
The Easter Island statues weigh tonnes. A lot of people (be) involved in moving them.
must have been
The Islanders (move) the statues by carrying them. They were too heavy.
can’t have moved / couldn’t have moved
They (transport) the stones using ropes. It is at least possible.
might have transported / may have transported / could have transported
Islanders said the statues ‘walked’; this (mean) that they were moved in an upright position.
might have meant / may have meant / could have meant
They ( not move) all the statues in the same way. Perhaps it depended on the distance.
may not have moved / need not have moved / might not have moved
Archaeologists have found human bones so the Islanders (bury) their dead around the statues.
must have buried
They also have found red pigment which (be) used to paint the statues.
may have been / might have been / could have been
