初二英语造句用 when 和 while 引导的时间状语从句 一个造一句谢谢!当UFO离开的时候 女孩 在干什么?她在吃

是每个都用when和while,还是只要用到就可以呢,有点歧义
1.What was the girl doing when the UFO left?
She was eating ice-cream.
2.What was the boy doing while the UFO was leaving?
He was taking a photo.
3.What was the woman doing when the UFO left?
She was watching the UFO.
4.What was the man doing while the UFO was leaving?
He was riding his bike.