• Alexander Fleming became interested in the control of bacteria while he was working as a doctor during the First World War.
  • This summer the pool worked only from June till August.

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I wonder, doesn't both "from June till August" and "during the First World War" express time frame within which sth happened? If so, why do we use Past Continuous in the first sentence, while we use Past simple in the second one?

  • This isn't an answer but the use of tenses is very dependant on the mood the author is trying to create, are they trying to make it sound like a long time ago, are they trying to make it sound in the past but still relevant. So there aren't rules that hard and fast, more general guidelines. – WendyG Feb 12 at 11:23

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