sudden各种形式

sudden的副词suddenly

sudden的形容词sudden

sudden的名词 suddenness

What is the motivation behind this sudden change?

这种突然转变背后的动机是什么？

The sudden noise made her start.

突如其来的声音吓了她一跳。

His heart gave a sudden leap when he saw her.

他看见她时，心猛地一跳。