英语能否用 very 修饰 mistaken，这是一个有争议的问题。

1. L.G.Alexander 的 LEGP 则认为可以说 very mistake：

2. Swan 的 PEU 认为不可以说 very mistake：

也就是说，网友的下面这个句子不能算错：

If anyone thought the affair was over, they were very mistaken. 如果有人认为这一事件已经结束，那他们就大错特错了。

但通常的说法应该是：

If anyone thought the affair was over, they were (very) much mistaken.