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the tunnel would be well-ventilated if tall chimneys were bu

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the tunnel would be well-ventilated if tall chimneys were built above sea level 这句是虚拟语气吗?
if tall chimneys were built above sea level 这句是built 是过去分词做定语对吗
the tunnel would be well-ventilated if tall chimneys were bu
1.是 would+if很明显
2.不是 were built 是谓语,表示被动,被修
再问: 是被动语态还是分词作表语 ? if tall chimneys were built above sea level 3楼说分词作表语 。。?
再答: 你看,烟囱是被修吧,be done是整体表被动无疑。而if引导完整句子,如果他们不是谓语,就陈分残缺了,所以不可能是表语
再问: 噢 谢谢 明白了,,