Coordinate and Sequential Compound Sentences
时而…时而… (now…now) and 一时…一时… describe a state that alternates between two conditions, while 便 is a written form of 就 that links an event to the one that follows. Together they join coordinate and sequential clauses.
In English
These patterns link clauses. 时而…时而… and 一时…一时… both describe something that alternates between two conditions: 天气时而晴，时而雨, and 心情一时好，一时坏. 时而 suits scenes and events, and 一时 is often used for moods.
便 is the written form of 就: after a clause that sets the trigger (often with 一 or 只要), it marks the next action or result, as in 他一到公司，便开始工作. 便 mostly belongs to narrative and formal writing rather than casual speech.
一时…一时… = near-synonym of 时而…时而…, slightly more colloquial-literary, often for emotional/mood swings: 一时高兴，一时生气 (happy one moment, angry the next).
便 (biàn) = formal written equivalent of 就, marking immediate sequence/consequence: Clause A (often with 一/只要) + 便 + Clause B = 'as soon as/given A, then B'. Common in written narrative and formal argument, less common in casual speech.
Worked examples
| Chinese | Pinyin | English | What it shows |
|---|---|---|---|
| 天空时而乌云密布，时而阳光明媚。 | Tiān kōng shí ér wū yún mì bù, shí ér yáng guāng míng mèi. | The sky is now covered with dark clouds, now bright with sunshine. | Minimal 时而…时而… frame: two alternating weather states |
| 他的态度一时热情，一时冷淡，让人捉摸不透。 | Tā de tài dù yì shí rè qíng, yì shí lěng dàn, ràng rén zhuō mō bú tòu. | His attitude is warm one moment, cold the next — hard to figure out. | New pattern: 一时…一时…, the near-synonym of 时而…时而…, here for mood swings |
| 他一到公司，便开始处理邮件。 | Tā yí dào gōng sī, biàn kāi shǐ chǔ lǐ yóu jiàn. | As soon as he arrived at the office, he began handling emails. | New pattern: 便 marks immediate sequence after a single completed event (一到) |
| 只要有一点时间，他便会拿起书本阅读。 | Zhǐ yào yǒu yì diǎn shí jiān, tā biàn huì ná qǐ shū běn yuè dú. | Whenever he has a bit of time, he picks up a book to read. | 便 extended to a habitual reading: pairs with 只要 for a recurring, not single-event, consequence |
Word by word
Each word in this pattern on its own: what it does here, the structure, three more examples, and the mistake to avoid.
时而…时而… (shí ér…shí ér)
Says a state or action alternates between two conditions from time to time.
Structure: 时而 + A，时而 + B
| Chinese | Pinyin | English |
|---|---|---|
| 海面时而平静，时而波涛汹涌。 | Hǎi miàn shí ér píng jìng, shí ér bō tāo xiōng yǒng. | The sea is calm at times and rough at others. |
| 他说话时而大声，时而小声，让人听不清。 | Tā shuō huà shí ér dà shēng, shí ér xiǎo shēng, ràng rén tīng bu qīng. | He speaks loudly at times and softly at others, so it is hard to hear him. |
| 小鸟时而飞到树上，时而落在地上。 | Xiǎo niǎo shí ér fēi dào shù shang, shí ér luò zài dì shang. | The bird flies up into the tree one moment and lands on the ground the next. |
Not: 他时而高兴。 时而 comes as a pair: 时而高兴，时而难过.
一时…一时… (yì shí…yì shí)
Close to 时而…时而…, often used for quick changes of mood or condition.
Structure: 一时 + A，一时 + B
| Chinese | Pinyin | English |
|---|---|---|
| 她的心情一时好，一时坏，谁也猜不透。 | Tā de xīn qíng yì shí hǎo, yì shí huài, shéi yě cāi bu tòu. | Her mood is good one minute and bad the next, nobody can guess it. |
| 病人的体温一时高，一时低，医生很担心。 | Bìng rén de tǐ wēn yì shí gāo, yì shí dī, yī shēng hěn dān xīn. | The patient's temperature goes up and down, and the doctor is worried. |
| 他一时想去，一时又不想去。 | Tā yì shí xiǎng qù, yì shí yòu bù xiǎng qù. | One moment he wants to go, the next he does not. |
Not: 他一时一时高兴。 Each 一时 needs its own predicate: 一时高兴，一时难过.
便 (biàn)
A written form of 就, linking one action or condition directly to the next.
Structure: Clause 1, 便 + clause 2
| Chinese | Pinyin | English |
|---|---|---|
| 他一听到消息，便立刻赶了过去。 | Tā yì tīng dào xiāo xi, biàn lì kè gǎn le guò qù. | As soon as he heard the news he hurried over. |
| 天一亮，农民们便下地干活了。 | Tiān yí liàng, nóng mín men biàn xià dì gàn huó le. | As soon as it was light, the farmers went to work in the fields. |
| 只要天气好，她便会去公园散步。 | Zhǐ yào tiān qì hǎo, tā biàn huì qù gōng yuán sàn bù. | Whenever the weather is good, she goes for a walk in the park. |
Not: 他回家便了睡觉。 便 is an adverb before the verb; 了 goes after: 便睡觉了.
In the official HSK 3.0 grammar outline: level 5, adverbs (关联副词).
Compared side by side: 时而…时而… vs 一时…一时….
What you need first
Every topic in GraphChinese names its own prerequisites, and these are the grammar points this one is built on. If a sentence here will not parse, one of them is why.
What this opens up
These patterns list Coordinate and Sequential Compound Sentences among their own prerequisites, so they become readable once this one holds.
Questions about Coordinate and Sequential Compound Sentences
What does 并列复句与承接复句 (Coordinate and Sequential Compound Sentences) mean in Chinese?
时而…时而… (now…now) and 一时…一时… describe a state that alternates between two conditions, while 便 is a written form of 就 that links an event to the one that follows. Together they join coordinate and sequential clauses. It is an HSK 6 grammar point.
How do you use 并列复句与承接复句 (Coordinate and Sequential Compound Sentences) in a sentence?
天空时而乌云密布，时而阳光明媚。 — Tiān kōng shí ér wū yún mì bù, shí ér yáng guāng míng mèi. — The sky is now covered with dark clouds, now bright with sunshine. Minimal 时而…时而… frame: two alternating weather states.
What do you need to know before 并列复句与承接复句 (Coordinate and Sequential Compound Sentences)?
Advanced Conjunctions (HSK 6), 又…又… (HSK 4), Tight Compound (HSK 2), Complex Sentences (HSK 5). This pattern is built out of them, so a sentence here that will not parse usually means one of them has not landed yet.
What does 并列复句与承接复句 (Coordinate and Sequential Compound Sentences) lead to?
Alternative, Conditional and Concessive Compound Sentences (HSK 6), Multi-Layer Compound Sentences (HSK 6). Each of them names 并列复句与承接复句 (Coordinate and Sequential Compound Sentences) among its own prerequisites.
What is the difference between 时而…时而… and 一时…一时…?
Both describe alternation. 时而 is neutral and suits scenes and weather, while 一时 sounds a little more literary and is mostly used for moods and quick changes of mind.
Is 便 the same as 就?
It has the same meaning of 'then', but it is for writing and formal speech. In daily speech use 就: 他一听到消息就赶过去了。
Coordinate and Sequential Compound Sentences is one topic of 829. GraphChinese teaches them in prerequisite order, so this pattern reaches you on the day everything it rests on is proven. The whole course, HSK 0 through HSK 6, is $49 once for lifetime access.
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