while the boy was walking down the street,the UFO landed同义句4种
问题描述：
while the boy was walking down the street,the UFO landed同义句4种
答
1、UFO landing when the boy walking down the street
2、 The boy was walking down the street when a UFO landed.
答
the UFO landed when the boy was walking down the street
the UFO landed as well as the boy was walking down the street
答
常见的标准变化形式如下：
= The boy was walking down the street when the UFO landed.
= When the boy was walking down the street,the UFO landed.
= The UFO landed while the boy was walking down the street.
= The UFO landed when the boy was walking down the street.
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