Rashi on Genesis 29:3/רש"י על בראשית כ״ט:ג׳

1ונאספו [AND THITHER WERE ALL THE DROVES] GATHERED — they regularly gathered there because the stone was a heavy one

2וגללו AND THEY ROLLED THE STONE — it means and they used to roll. In the Targum it is therefore translated by ומגנדרין (a participle). The idea of frequentative action is expressed indifferently by the imperfect (future) or the perfect (past) because every action that occurs continually, has already happened and will again happen,

3והשיבו AND RESTORED [THE STONE] — In the Targum it is translated by ומתיבין(a participle) — and they were always putting back.