这首歌颇喜欢，尤其全破后我还听了好几次，歌词如下：
Am I the one to hold
This crown of ash and salt?
Their kindness calls to me
I have to block it out
My voice has grown so somber
These words don't seem like mine
But the iron won't subside
No matter, no matter what I try
Am I raindrops in the flood?
In this emptiness, in the storm
If I falter, if I fall
The wave inside my soul carries all I know
Who can take my hand in the flood?
A voice calls me forth
Through darkness unknown
My heart with silence burns
Through solemnness and bone
The edge beyond the shore
This wеight of wood and rot
I long to reach the other
To find, to find thе path we lost
Am I raindrops in the flood?
In this emptiness, in the storm
If I'm broken, if I'm torn
The wave inside my soul carries all I knew
Who can take my hand in the flood?
歌词大概的意境都能体会，不解的是第一次副歌是all I know，第二次是all I knew，是
有什么特别的用意使用不同时态吗？
闲聊一下，谢谢回答！