machu picchu ruins may have been built by the incas. the incas might have built machu picchu ruins....

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hu Picchu ruins may have been built e Incas. The Incas might have built Machu Picchu ruins. ( Perfect Modal in the active voice) ( Perfect Modal in the passive voice) ar. Perfect modals in the passive voice for speculating about the Macchu Picchu Ruins

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Page 1: Machu Picchu ruins may have been built by the Incas. The Incas might have built Machu Picchu ruins. ( Perfect Modal in the active voice) ( Perfect Modal

Machu Picchu ruins may have been built by the Incas.

The Incas might have built Machu Picchu ruins. ( Perfect Modal in the active voice)

( Perfect Modal in the passive voice)

Grammar. Perfect modals in the passive voice for speculating about the past.

Macchu Picchu Ruins

Page 2: Machu Picchu ruins may have been built by the Incas. The Incas might have built Machu Picchu ruins. ( Perfect Modal in the active voice) ( Perfect Modal

Aliens could have made The Nazca Lines.

The Nazca Lines could have been made by aliens.

The Nazca

Lines

(Active voice)

(Passive voice)

Page 3: Machu Picchu ruins may have been built by the Incas. The Incas might have built Machu Picchu ruins. ( Perfect Modal in the active voice) ( Perfect Modal

The storm The car accident

Verb : cause The car accident must have been caused by the storm. (Passive)

The storm must have caused the car accident. (Active)

Page 4: Machu Picchu ruins may have been built by the Incas. The Incas might have built Machu Picchu ruins. ( Perfect Modal in the active voice) ( Perfect Modal

Short responses with perfect modals in the passive voice

A:Do you think dinosaurs were killed by a meteor?

B: They might have been.B: They had to have been.

Page 5: Machu Picchu ruins may have been built by the Incas. The Incas might have built Machu Picchu ruins. ( Perfect Modal in the active voice) ( Perfect Modal

The dinosaurs might (or may) have been killed by a meteor. The trees could have been destroyed by a fire.The gold figures might not (or may not have been lost.

The stone balls must have been moved by animals.The drawings must not have been discovered until later.

Page 6: Machu Picchu ruins may have been built by the Incas. The Incas might have built Machu Picchu ruins. ( Perfect Modal in the active voice) ( Perfect Modal

The crater had to have been caused by a meteorite.

The trees couldn’t have been burned by a fire.