Put the past form of these verbs into the text. Be careful: some are regular but others are irregular!
The Highland Games (exist) in Scotland in the 11th century. Some believe that King Malcolm III (organize) a foot race that (become) the start of the Games. Others believe the Games (begin) even before that.
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Regular verbs: V + -ed
Irregular verbs: be → was / were begin → began become → became do → did