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My class is working on the past progressive and the simple past, and I was wondering if I can use when instead of while for the following sentence

While I was eating, the bell rang.

When I was eating, the bell rang.

Thank you

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An adverbial clause beginning with when (or indeed with any subordinating conjunction), can be used grammatically in any tense. (BTW, "past progressive" is not a tense; past is a tense, and progressive is a construction).

As for the difference between when and while, the first is general and non-specific, but while implies an event with duration that contains a point in time (While he slept/was asleep/was sleeping, the phone rang) or that overlaps some other duration (While he read/was reading, she was writing).

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They mean different things.

  • While = during the time I was doing something.

  • When = over the entire period of time. So:

    While I was working, someone called. When I was working at the mall, I was never at home. When Bill was running, he lost a lot of weight.

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    So if I say, "When I was in Florida I went to Kennedy Space Center." could I have also gone to Disney World? – Jim Feb 11 '15 at 4:53
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"while" does indeed mean "during that time", but it could be any part of that time, even a short part (we presume the bell was not ringing the ENTIRE time you were eating—although "while" does not exclude that possibility, if that were the case, we would say "the bell kept ringing all the time [while] I was eating").

But "when" is often used to mean "at a specific time", rather than over the entire period of time. Thus we would more likely say "the bell rang when I started eating" or "the bell rang {when/as} I finished eating".

So it is not wrong to use "when", but "while" fits better with the ongoing nature of past progressive "was eating".

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    For state-machine speak, while is a state, when is an event. – Blessed Geek Feb 11 '15 at 9:52
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    Just for fun: old-style Yorkshire speech uses 'while' to mean 'until'. Which caused a few problems at railway crossings when they put up signs saying "Wait at the line while the red light flashes". – David Garner Feb 11 '15 at 17:08
  • Reminds me of the blonde who alternately stepped on the gas and the brake, luching and screeching. She was at a blinking red light. – Brian Hitchcock Feb 14 '15 at 10:11

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