pps: finished actions with a present effect, emphasize the result of the action, to suggest that something is permanent, to say how often something has happened, with superlatives and with the first, the second, the last time, ppc: unfinished actions, to emphasize the action itself, to suggest that something is temporary, to say how long something has been happening, we do not use stative verbs such as have, know, seem in this tense,

pps vs ppc

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