When the UFO took off ,the girl was waiting for a bus.(变成一般疑问句）————————————————————再加上一个The girl was shopping when the alien got out.(用while改写句子）——————————————————
问题描述：
When the UFO took off ,the girl was waiting for a bus.(变成一般疑问句）
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再加上一个
The girl was shopping when the alien got out.(用while改写句子）
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答
Was the girl waiting for a bus when the UFO took off ？
答
Was the girl waiting for a bus when the UFO took off?
答
Was the girl waiting for a bus when the UFO took off
The girl was shopping while the alien was getting out.
答
The girl was waiting for a bus, when the UFO take off?