Ramban on Genesis 41:6/רמב"ן על בראשית מ״א:ו׳

1SPRUNG UP AFTER THEM. Not that he saw them springing up —[although the word tzomchoth is actually in the present tense] — for he saw ripe ears of corn. But the verse is to be interpreted as if it said “they sprang up,” [i.e., tzamchu, which is in the past tense], suggesting that no sooner did he see the full ears than he immediately saw the thin ones coming up after them, for he saw the sign of immediacy in all facets of the dream.