忽然 hūrán only works as an adverbial modifier — never as an adjective, and never with 的 de before a noun. Its focus is speed: something happened quickly, within a short window of time, whether or not it was expected.
1 Usage
S + 忽然 hūrán + VP
忽然 hūrán goes right before the verb phrase. No degree adverb (很 hěn, 非常 fēicháng, 太 tài…) can come in front of it.
運動完我忽然非常餓运动完我忽然非常饿
After exercising, I suddenly became very hungry.
怎麼忽然下大雨怎么忽然下大雨
How did it suddenly start pouring rain?
我忽然覺得你很可怕我忽然觉得你很可怕
I find you very scary, right in this moment.
啊!忽然想起來我忘了買雞蛋啊!忽然想起来我忘了买鸡蛋
Oh! I just remembered I forgot to buy eggs.
天氣忽然變冷了天气忽然变冷了
The weather suddenly turned cold.
你怎麼忽然不說話了你怎么忽然不说话了
Why did you suddenly stop talking?
他忽然停下腳步他忽然停下脚步
He suddenly stopped in his tracks.
2 Common Mistakes
忽然 hūrán trips people up because it looks and behaves like 突然 tūrán — but it only works as an adverb.
❌
運動完我非常忽然餓运动完我非常忽然饿
✅
運動完我忽然非常餓运动完我忽然非常饿
No degree adverb (很 hěn, 非常 fēicháng, 太 tài…) can come in front of 忽然 hūrán — it always goes right before the verb phrase.
❌
忽然的變化忽然的变化
✅
突然的變化突然的变化
忽然 hūrán is an adverb only, so it can’t take 的 de to modify a noun. Use 突然 tūrán instead for that.
3 忽然 vs 突然
A quick side-by-side of the two words.
|
忽然 hūrán |
突然 tūrán |
| Focus |
Short time span — something happened quickly |
Unexpectedness — something wasn’t anticipated |
| Word class |
Adverb only |
Adverb and adjective |
| With 很 hěn/非常 fēicháng/太 tài |
❌ Not allowed |
✔️ 很突然 hěn tūrán, 非常突然 fēicháng tūrán, 太突然 tài tūrán |
| With 得 de |
❌ Not allowed |
✔️ 來得很突然 lái de hěn tūrán |
| Modifying a noun with 的 de |
❌ 忽然的變化 hūrán de biànhuà |
✔️ 突然的決定 tūrán de juédìng |
4 Practice
Translate each sentence into Chinese, then tap the card to check your answer.
01Suddenly, he gets angry.
他忽然生氣了他忽然生气了
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02I just (suddenly) realized it.
我忽然懂了我忽然懂了
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03She suddenly stood up.
她忽然站起來了她忽然站起来了
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04The car suddenly stopped.
車子忽然停了车子忽然停了
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05I suddenly felt dizzy.
我忽然覺得頭暈我忽然觉得头晕
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06He suddenly left without saying goodbye.
他忽然走了,沒有說再見他忽然走了,没有说再见
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07The phone suddenly rang.
電話忽然響了电话忽然响了
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08She suddenly cried.
她忽然哭了她忽然哭了
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09I suddenly remembered his name.
我忽然想起他的名字我忽然想起他的名字
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10The music suddenly stopped.
音樂忽然停了音乐忽然停了
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