tree after tree went down,cut down by the water,which must have been three metres deep

问题描述:

tree after tree went down,cut down by the water,which must have been three metres deep
cut down by the water,做什么成分?

cut down by the water做"伴随状语",这个伴随状语的逻辑主语是tree after tree,所以cut在这里是“被动态“的
全句意思是:
大树被洪水连根拔起,一棵一棵地倒下了,洪水足足有3米深.