it was impossible for them to go out to do anything interesting能不能说成they were impossible to go out to do anything interesting?
不可以，it这里是形式主语，没有实质意思，也不能用they替换追问
为什么这句不能用人称代词做主语呢？
追答这个是固定句式 it is（was）+adj+（for sb） to do sth
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