UC知道用when或while填空。是否两个单词都可以？如果不是，请一定告诉我为什么不可以填另一个？谢谢
来源：百度知道 编辑：UC知道 时间：2024/05/21 22:23:18
1：The boy was walking down the street ( ) a UFO landed.
2:The girl was shopping ( ) she saw the alien get out.
3:( ) the alien was buying a souvenir,the girl called the police.
4:( ) the alien was visiting the museum,the boy called the TV station.
2:The girl was shopping ( ) she saw the alien get out.
3:( ) the alien was buying a souvenir,the girl called the police.
4:( ) the alien was visiting the museum,the boy called the TV station.
when:后面的句子动词可以是瞬间的，也可以是持续性的。
while：后面的动词一般是持续性的。
第一句：填when，飞碟的降落看做是瞬间的动作。
第二局：when，也是瞬间的动作
第三局：while，buy a souvenir 是个要持续一段时间的动作。
第四局：while，visiting the museum也是个持续性的动作
一般来说when后跟的是一般过去时，while后则是过去进行时。
2楼的是说的更让人不懂