2. • 3
• How to use MEC
• Identify and use perfect modals in
passive voice to present a theory about a
past event.
• Practice skills to present a theory about a
past event.
1
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3. 3
1/14Activity: Grammar. Look at the sentences below and identify the use
and the structure.
Present a
theory about
a past event
Perfect modals to speculate about the past.
Not certain
OThe dinosours might have been killed by a meteor.
OThe trees could have been destroyed by a fire.
Almost certain
OThe stone balls must have been moved using
animals
Very certain
OThe crater had to have been caused by a
meteorite.
OThe trees couldn’t have been burned in a fire.
4. 3
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Activity: Grammar. Look at the structure.
Present a
theory about
a past event
Perfect modals to speculate about the past.
modal verb have been
verb in
past part
