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Help the quirky archaeologist finalize his lecture notes on the newly discovered "Tomb of the Quack" by selecting the correct active or passive infinitives.
The ancient king is widely understood ______________________________ with his favorite collection of rubber ducks. The royal architects are thought ____________________________ the tomb's entrance to keep intruders out. However, the magical traps are now known _________________________________ by a stray cat in 1922.
The correct answers are:
- is widely understood to have been buried
- are thought to have cursed
- are now known to have been triggered
Explanations:
- to have been buried: The king didn't bury himself; someone else buried him in the past. Therefore, we need the perfect passive infinitive.
- to have cursed: The architects actively placed the curse on the entrance in the past. We need the perfect active infinitive here.
- to have been triggered: The traps did not trigger themselves; they were triggered by a cat in the past. This requires the perfect passive infinitive.