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The Easter Island statues definitely were not created by aliens.
The Easter Island Statues couldn't have been / must not have been created by aliens.
It's possible that this artwork was made in Europe.
This artwork might have been made in Europe
The window was broken, so the thieves _______ (get) in through that window.
must have gotten
You _______ (pay) more attention! Now we are lost.
should have paid
I don't know where they went--they ________ (go) to Paris or Marseille.
could have gone
You _______ (be) ill yesterday. Jessie saw you at the bowling alley.
couldn't have been
I wonder why Jim hasn't arrived yet? He _______ (take) the wrong train.
might have taken
I didn't know you were going to Phil's party yesterday. You ______ (tell) me!
should have told
Sarah looked very happy. She ______ (pass) her driving test. She had been preparing for a long time.
must have passed
I _________ (review) more for the exam. I was lazy, and now I'll fail!
should have reviewed
Nobody knows exactly why he died. But we think it ______ (be) an accident.
might have been
Maybe the CIA killed president JFK (may)
The CIA may have killed JFK.
I have a stomach ache. I _____ (eat) so much.
shouldn't have eaten
I'm not surprised that you're tired. You _____ (stay) up so late.
shouldn't have stayed up
We _____ (leave) the burgers on the grill for so long. They were all burnt.
shouldn't have left
I didn't know you were free last Saturday. We ___ (go) to a concert.
could have gone
