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

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.
如果对你有所帮助,请点击我回答下面的“选为满意回答”按钮,