suddenly和All of sudden 的区别如下：
suddenly着重于动作在没有预兆而突然发生，也就是“意料之外地”，例句：
Family values are suddenly the name of the game. 家庭价值观突然变得重要起来。
He mays uddenly take a dislike to foods that he's previously enjoyed. 对以前爱吃的食物，他兴许突然就没了胃口。
all of sudden着重于动作的迅猛程度，也就是“刹那之间”、“一眨样的功夫”或“千钧一发”，例句：
We had to stop all of sudden as well. 我们同样不得不突然停下来.
All of sudden he was attacked by a robber. 突然他遭到一个强盗的袭击.?
all of sudden的用法常放在句首，suddenly的用法比all of sudden广阔。
suddenly：I suddenly remembered that I hadn't locked the door.
我突然记起我没有锁门.
all of sudden：All of sudden we heard a loud explosion that shook the building.
突然之间我们听到一声巨大的爆炸声冲击着那个建筑物。