he said that it would be possible to build a platform.This platform would serve as a port and a railway station.后面一句为什么要用would?这是虚拟吗?

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• he said that it would be possible to build a platform.This platform would serve as a port and a railway station.后面一句为什么要
• he said that it would be possible to build a platform.This platform would serve as a port and a railway station.后面一句为什么要用would?这是虚拟吗?
• possibly 和possibleCindy‘s sister bought her a gift.It’s ___ a hair clip.为什么是possiblyThey are ____ nothing for us at the train station.为什么是possibly
• it would be possible.改否定（内详）It would be possible to have an observatory in our shcool.（改为否定句）_____ _____ _____ _____to have an observatory in our shcool.可不可以改成It wouldn't be possible to have an observatory in our shcool.把possible 改成impossible是答案，那么我这个改句算错么？would改成wouldn't有问题么？