突然英语短语：all of a sudden：突然地;出乎意料地

例句：

All of a sudden she didnt look sleepy any more.

她突然看起来一点都不困了。

sudden：adj.突然的;忽然的;骤然的

派生词： suddenness n.

例句：

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。

The children were surprised by the sudden entry of their teacher.

老师突然进来使孩子们感到意外。

All of a sudden someone grabbed me around the neck.

猛不防有人抓住了我的脖子。