bad变副词为什么不双写

变副词没有双写规则。

The man felt that his position was badenough .他感到自己倒霉透顶。

It can break up a bad traffic snarl .它可以结束严重的交通混乱局面。

There would be some very bad days ahead .今后几天将会是非常艰难的。

I always lose at cards ， with my bad luck .我运气不好，打牌总是输。

Do not spring bad news on his mother !别单刀直入把坏消息告诉他妈妈。