Learn Russian: Председатель комитета долго шёл вдоль улицы. - The chairman of the committee walked along the street for a long time.

The verb шёл is a unidirectional verb of motion. Even though the action took a long time (долго), the chairman was walking in a single, continuous direction. If he had been pacing back and forth or wandering aimlessly, we would use the multidirectional verb ходил.

Does the adverb долго affect the aspect of the verb here?

Yes! Words that emphasize the duration of an action, like долго (for a long time), strongly attract the imperfective aspect. That is why we use the imperfective шёл, as the focus is on the ongoing process of the walk rather than reaching a final destination.

We often see "along the street" translated as по улице. Why use вдоль улицы here?

The preposition вдоль specifically emphasizes moving parallel to the length of something, often along its edge or border, and it always takes the Genitive case. The preposition по with the Dative case (по улице) is a more general "along" or "down" and can imply walking anywhere on the surface of the street.

Since we are learning about verbs of appointing, how would the case of председатель change if we said "He was appointed chairman of the committee"?