陈美琳的回答：

all 做限定词: all these people all做代词： all of these people But all these disappeared when the flames went out. 这里these是代词， all作限定词修饰these, 句子没有问题。 句子可以改成 But all of these disappeared..., 此时all作代词

李广庆的回答：

all 做限定词: all these people all做代词： all of these people But all these disappeared when the flames went out. 这里these是代词， all作限定词修饰these, 句子没有问题。 句子可以改成 But all of these disappeared..., 此时all作代词