turn to ashes (化为泡影) 中的ashes不能用单数。句子结构应该是:状语从句:when they found (that)a beautifully-cooked wallet and notes turned to ash!【句子成分分析】they状语从句的主语;found状语从句的谓语;?(that)宾语从句的引导词,不充当成分,可以省略;a beautifully-cooked wallet and notes宾语从句的主语;turned to ash 宾语从句的谓语 这是新概念的课文中的句子。