1.The boy was walking down the street when a UFO landed.

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1.The boy was walking down the street when a UFO landed.
2.When a UFO landed,the boy was walking down the street.
3.While I was doing my homework,the plane landed.
4.When I was doing my homework,the plane landed.
5.The boy was walking down the street while a UFO landed.
6.While the boy was walking down the street,the UFO landed.
7.When the boy was walking down the street,the UFO landed.
While is(are) right and why?Thanks.

5.The boy was walking down the street while a UFO landed
因为while不用于一般过去时而是多是现在进行时

1.The boy was walking down the street when a UFO landed. The boy was walking down the street when a UFO landed on Cen the boy was walking down the street when the UFO landed同一句 the boy was walking down the street when the UFO landed改为一般疑英语翻译The boy was walking down the street when the UFO landed. The boy was walking down the street when the UFO landed.(改为同 the boy was walking down the street when the UFO landed 神马意思 I was walking down the street when a UFO landed down. l was walking down the street when a ufo landed right in fro I was walking down the street when a UFO landed right in fro while the boy was walking down the street,the UFO landed （while the boy was walking down the street）,the UFO landed 对