Translation:He runs along the street.
How would one say "He runs the length of the street"?
"הוא רץ את אורך הרחוב"
Why is this requiring a past tense form? Do we " know" that yet?
What past tense? רץ is both present tense and past tense.
Is there a different way to say, "He runs down the street"?
הוא רץ במורד הרחוב
No. If it doesn't have houses, it's not a רחוב, but a דרך. So רחוב is like a street, and דרך is like road.