keannu
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- Dec 27, 2010
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- Korean
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- South Korea
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This is a practice question of a grammar book, and I think either "when" or "while" suits it. Does it have to be only "while" here? I think "while" is usually for two simultaneous actions, and "when" is for a background action, but I can't tell the difference exactly.
gz194
ex)He fell off the ladder while(when?) he was changing a light bulb.
gz194
ex)He fell off the ladder while(when?) he was changing a light bulb.