Comparing "turan" and "huran"
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Keywords
Both 突然 (tūrán) and 忽然 (hūrán) express the something happens in a very short time or is unexpected. Both can be translated as "suddenly." However, 突然 is a bit harsher in tone while 忽然 is a bit softer (you might say 突然 is more 突然 than 忽然), and only 突然 can be used as an adjective meaning "sudden."
Contents
Both 突然 and 忽然 can be used as Adverbs
突然 and 忽然 both can put in the sentence as adverbs. Just make sure to put them before the verb or adjective they modify!
Before a Verb
突然／忽然 + Verb
Examples
- 睡觉 的 时候，我 的 电话 突然 响了。
- 睡觉 的 时候，我 的 电话 忽然 响了。While I was sleeping, my phone suddenly started to ring.
- 他 说着 说着 突然 不 说 了。
- 他 说着 说着 忽然 不 说 了。He was talking and talking, and suddenly stopped.
Before an Adjective
突然／忽然 + Adj.
Examples
- 天 突然 暗 了。
- 天 忽然 暗 了。The sky suddenly got dark.
- 灯 突然 不 亮 了。
- 灯 忽然 不 亮 了。The lights suddenly went out.
At the Beginning of a Sentence
You can place 突然 and 忽然 at the beginning of a sentence, just make sure to add a comma after it!
Structure
突然／忽然，⋯⋯
Examples
- 突然，他 进来 了。
- 忽然，他 进来 了。Suddenly, he entered.
突然 can be used as an Adjective
突然 can be used as an adjective (directly modifying nouns), while 忽然 cannot.
Structure as an Adjective
突然 + (的) + Noun
Examples
- 这 是 一 场 突然 事故，我们 都 没 想到。This was a sudden accident. None of us thought it could happen.
- 你 知道 怎么 处理 这 种 突然 的 情况 吗？Do you know how to handle this kind of sudden situation?
突然 can be used as a complement
突然 as an adjective can also be used as a complement (called 补语 in Chinese). 忽然 cannot be used as a complement.
Structure for verb and complement
Subj. + Verb + 得 + 突然
Examples
- 事情 发生 得 太 突然，我们 不 知道 怎么 办。Things happened so suddenly, we didn't know what to do.
- 这 场 雨 下 得 太 突然，都 淋湿 了。This rain fell so suddenly, everything got soaked.
突然 can be used as the predicate
Just like other adjectives, 突然 can be used as the predicate of a sentence. It is usually added with a modifier like 很, 非常, 不 etc. It can also end with complements like 得很, 得多, 极了, etc.
Structure with modifier + 突然
Subj. + Modifier + 突然
Examples
- 这 个 决定 太 突然 了。This decision was too sudden.
- 对 她 来说，这 次 升职 其实 不 突然。To her, this promotion wasn't actually surprising.
Structure with 突然 + modifier
Subj. + 突然 + Modifier
Examples
- 她 离开 上海 突然 得 很。Her leaving Shanghai was really sudden.
- 这 次 生病 比 上 次 突然 得 多。Getting sick this time was much more sudden than the last time.
Example of right and wrong sentences
- 这 个 决定 很 忽然。
- 这 个 决定 很 突然。 突然 can be a predicate, while 忽然 cannot.This decision is very sudden.
- 一切 发生 得 太 忽然。
- 一切 发生 得 太 突然。 突然 can be a complement, but 忽然 cannot.Everything happened too suddenly.
Example Dialog
- A: 我 正在 睡觉，忽然 电话 响 了 ，是 Amy 打 来 的。I was sleeping, when suddenly the phone rang. It was Amy.
- B: 她 说 什么 ？What did she say?
- A: 她 结婚 了 。She got married.
- B: 啊，这 个 消息 太 突然 了。Oh, this news is really sudden.
Sources and further reading
Books
- 现代汉语八百词（增订本） (pp. 540) [ →buy]
- 现代汉语虚词例释 (pp. 247) 卓越汉语－公司实战篇 →buy
- Chinese Grammar - Broken down into 100 items - Basic and Intermediate Levels (汉语语法百项讲练 - 初中级) (pp. 113) Anything Goes (无所不谈) →buy
Dictionaries
- 现代汉语词典（第5版） (忽然p.574 突然p.1378) →buy
