2 verses have
could
in Edition Clear Qur'an by Talal Itani / Al-Anfaal (The Spoils of War)

8:31And when Our revelations are recited to them, they say, “We have heard. Had we wanted, we could have said the like of this; these are nothing but myths of the ancients.”

8:50If only you could see, as the angels take away those who disbelieve, striking their faces and their backs: “Taste the agony of the Burning.”