独立分词结构,
All fligts having been canceled because of the snowstorm,we decided to take the train,这句话中having been canceled是独立分词结构,
但是为什么我不能理解成这句话是两个独立的分句,写成这样All fligts had been canceled because of the snowstorm,we decided to take the train.前面是个独立的句子,后面也是一个.回答的清楚有加分