The progressive (continuous) form is the more natural in both sentences. In the first, it emphasises the duration of the activity which filled the time-period referred to. In the second it emphasises the duration of the activity around the time-point of the requet to stop..
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AnonymousWhere were you yesterday afternoon? I was playing tennis.Where were you? implies What were you doing? What activities were you engaged in (during that time period)?
A
CalifJimWhere were you? implies ....etc
fivejedjonA fuller ... explanation ...Thanks! But I do tend to get wordy.