So it was fortunate that we didn't have to carry him中it 是形式主语吧,真主是we didn't have to carr

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So it was fortunate that we didn't have to carry him中it 是形式主语吧,真主是we didn't have to carr

Right.
为避免头重脚轻,将真正主语置后了.

是的

是的,it作为形式主语代替真正的主语that we didn't have to carry him,防止出现头重脚轻。