1239: Tense vs. Aspect: 'Do' and 'Have' May 1, 2018

The auxiliary verbs 'have' and 'do' (which is extremely rare outside of a few languages, having been borrowed from Cornish) have similar functions on the surface, but are extremely different. The difference between "I did [verb]" and "I had [verb]" is that while both 'do' and 'have' are often used to indicate past action instead of (or in addition to) conjugating the main verb, they show different grammatical aspects. Simply put, 'do' is for when the action is continuous or perhaps habitual "I did run" which is the imperfect aspect whereas 'have' only refers to that which has (had) an end, "I had run", which is the perfect aspect. This all becomes trickier considering the present tense "I have run" is the present tense but takes place in the past, and "I do run" is clunky; most people opt for simply 'I run' and only use 'do' for the negative form, or for emphasis.
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