突然是什么词性

突然是副词词性的词，英语为suddenly

例句

1.

They suddenly became aware of people looking at them.

他们突然意识到有些人在瞧着他们。

2.

Suddenly it clicked ─ we'd been talking about different people.

我们突然领悟到原来我们谈论的不是同一个人。

3.

It suddenly struck me how we could improve the situation.

我一下子明白我们如何能改善局面了。