[译] 如果他病得这么厉害，他的所有财富对他也没有什么用处。
[误] All his riches is no good to him if he is so ill.

[正] All his riches are no good to him if he is so ill.
[注] riches 表示“财富”，只有复数形式，没有单数形式，所以谓语动词也用复数形式。