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The online exercise Dig vs Dug helps students to practice and understand the difference between the two simple tenses, the past simple and the past perfect. To make the difference clear, the exercise provides some useful examples of the two tenses. The verb "dig" is used in the past simple form when describing something that has already occurred and can be combined with certain other verbs like "did". The verb "dug" is used in the past perfect form when writing about something that has already been completed. This exercise can help students of English grammar become familiar with the use of these two tenses and improve their understanding.
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