I dropped something onto the floor just now. What verb tense would be appropriate to describe the situation right after falling?
- The ball fell down
- The ball has fallen down
If you have it in mind to call attention to some effect of the ball's falling down, you'd use "has fallen", since this refers to the present end point of an interval of time during which an event occurred. If you simply want to report a past event, you'd use "fell".