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What could have happened?
Terry Fredrickson, Published on 25/02/2013
» We know what has happened, but we don't know what caused it. We all have our own ideas about the cause and express them freely. In English, this is a perfect opportunity to use the past forms of modal auxiliaries.
Simple present in narration
Terry Fredrickson, Published on 06/01/2013
» The JPL narration of an animation of the Curiosity mission to Mars is a great example of the use of the simple present in narration, one of the few times a single tense is used throughout.