Anonymous Why do we have to think about a period of time there? I don't. They mean the same, and I am liable to use either one without fear or favour.
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AnonymousWhy do we have to think about a period of time there?I don't. They mean the same, and I am liable to use either one without fear or favour. Both are an activity: one suggests a complete event ('a swim') while the other suggests the action ('swimming') but the practical difference is insignificant. Work on your irregular verb forms instead.
Anonymousa period of timeAn hour, three hours, a day, a weekend, 3 years, a class period, etc: any set of grouped time units.