英语当中,被动句是怎么倒装的?

英语当中,被动句是怎么倒装的?
Lying across the river is a bridge built two centuries ago.
还是Lying across the river is built a bridge two centuries ago.
我觉得Lying across the river是地点状语,位于句首应该完全倒装啊,但是资料上是第一个句子,

Lying across the river is a bridge built two centuries ago.是应该完全倒装,但是built two centuries ago是用来修饰bridge的,把它去掉句子结构不变,这个句子简化后是这样的：Lying across the river is a bridge .

Lying across the river is built a bridge two centuries ago.这个句子很不对.结构紊乱.a bridge 是主语,那谓语是什么呢?如果是built的话那is是什么成分呢?is(lying)才是谓语.

碰到这种句子把所有成分补全就很容易分析了.Lying across the river is a bridge(that was) built two centuries ago.可以看到里面有个修饰bridge的隐性状语从句.
再问： 你的意思我明白了，但是我还是有疑问： A bridge is lying across the river built two centuries ago.一座被建于两世纪前的桥横跨在江上。 上面是你还原的句子 A bridge is built two centuries ago lying across the river.横跨在江上的一座桥被建于两世纪之前。 这样改不行吗？谓语是is built，
再答： A bridge is built two centuries ago lying across the river。这个句子在ago处就已经结束了A bridge is built two centuries ago。lying是谓语成分，但是它的主语是什么呢？不是a bridge，因为a bridge 已经有is built 做谓语了。 另外，A bridge is lying across the river built two centuries ago应该写作A bridge built two centuries ago is lying across the river，状语从句应该紧跟它修饰的事物。
再问： lying across the river 是后置定语啊，如果状语从句必须紧跟在它修饰的事物上，那么 A bridge lying across the river is built two centuries ago。这样不知可不可以
再答： 纠正一下错误，前面我说的状语从句应该是定语从句。。。 A bridge lying across the river is built two centuries ago。不能忘全说错，语法结构没问题，但要这么表达才恰当：The bridge lying across the river is built two centuries ago。这里的桥是特指。
再问： 哦，我突然发现一个问题，A bridge lying across the river is built two centuries ago，这句话本身就是错的，因为谓语动词的时态是一般现在时，因此只能用is lying the river这种形式，要是改成我的那句话也应用was built two centuries ago，既然句子已经给了一般现在时的谓语动词，句意也就固定了。你说是吧
再问： 哦，我突然发现一个问题，A bridge lying across the river is built two centuries ago，这句话本身就是错的，因为谓语动词的时态是一般现在时，因此只能用is lying the river这种形式，要是改成我的那句话也应用was built two centuries ago，既然句子已经给了一般现在时的谓语动词，句意也就固定了。你说是吧
再答： 嗯，应该是用was，但是The bridge lying across the river was built two centuries ago是可以的，这里的lying across the river 是用来修饰bridge，动名词表示bridge的状态，was built 才是谓语。