As "was" is past tense, why does it denote a current action?
It's a then-current action. "Ongoing" would be a better word. And inasmuch as there is a reason, I suppose it's because in "was running", "running" is a state of being - essentially a sort of adjective - seen as being of a more thingy and permanent nature than the possibly transitory verb.
To be truly paradoxical, note that things that are permanently true ("The Thames runs through London") are indicated using the same simple present as things that may be only instantaneously true. (African-American vernacular English can distinguish these unambiguously.) The present imperfect ("is running") is used for things that extend beyond the present but maybe not for long.
It's a then-current action. "Ongoing" would be a better word. And inasmuch as there is a reason, I suppose it's because in "was running", "running" is a state of being - essentially a sort of adjective - seen as being of a more thingy and permanent nature than the possibly transitory verb.
To be truly paradoxical, note that things that are permanently true ("The Thames runs through London") are indicated using the same simple present as things that may be only instantaneously true. (African-American vernacular English can distinguish these unambiguously.) The present imperfect ("is running") is used for things that extend beyond the present but maybe not for long.
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