while多跟时间段,加 连续动词例如句中的keep guard ,也可以表转折,有然而的意思.
when多加 时间点,后跟短暂动词,如he was in the car when i saw him .中的see.但也可接连续动词
while大多不能替换 when ,但when 大多可替换while,
你给的句子中,WHILE换成WHEN.语法上没问题,意思改变也小.可以替换
有关while 用法while two defectives were keeping guard at the doo
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