AG1 UNIT 5 EXERCISE 1 DISCOVER THE GRAMMAR PAGE 74

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Columbus may not have been the frst to visit the Western Hemisphere.

He might not have been the frst.

It must have been about the year 1000 when LeiF Erickson visited the New World.

I’m almost certain it was about the year 1000.

Vinland couldn’t have been NewFoundland.

It can’t have been NewFoundland.

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