时A时B: Alternating from Time to Time in Chinese
时A时B
时A时B presents two contrasting states or behaviors as alternating from time to time. Each 时 introduces one parallel element, without claiming abruptness or a regular schedule. It commonly describes variable performance, length, mood, or weather. Both slots must concern the same topic and form a meaningful contrast on one dimension.
Published July 23, 2026
Reviewed July 23, 2026
01 / PATTERN
See the Structure
MODEL
Subject + 时 + State A + 时 + State B
Read the structure
时A时B presents two contrasting states or behaviors as alternating from time to time. Each 时 introduces one parallel element, without claiming abruptness or a regular schedule. It commonly describes variable performance, length, mood, or weather. Both slots must concern the same topic and form a meaningful contrast on one dimension. Keep the model Subject + 时 + State A + 时 + State B visible while you compare each sentence.
他的成绩时好时坏。
His grades fluctuate between good and bad.
Choose the right context
Describe performance alternating between good and bad. Present sound, length, or mood as variable over time. State recurring contrast without specifying an exact schedule.
小鸟的叫声时长时短。
The bird's calls vary between long and short.
Respect the boundary
Do not omit the second 时. Do not use different subjects for A and B inside one compact pattern. Do not use it for one irreversible change from A to B.
他的成绩时好坏。
(His grades sometimes good bad.)
Repair the pattern
The second 时 is omitted: Each alternating state requires its own 时: 时好 and 时坏. Two subjects are forced into one compact alternation: 时A时B describes alternating states of one topic; separate subjects require full clauses with 有时.
他的成绩时好时坏。
Use the repaired structure without changing the intended meaning.
02 / MAP
Read the Sentence
Read from left to right and notice the job performed by each part. The labels describe this example; they are not a rule that every Chinese sentence must copy.
他的成绩时好时坏。
His grades fluctuate between good and bad.
他的
Subject
This part occupies the Subject position in the model pattern.
成绩
时
This part occupies the 时 position in the model pattern.
时
State A
This part occupies the State A position in the model pattern.
好
时
This part occupies the 时 position in the model pattern.
时
State B
This part occupies the State B position in the model pattern.
坏
Subject
This part occupies the Subject position in the model pattern.
03 / EXAMPLES
Examples You Can Reuse
Keep the structure stable while changing the people, objects, times, or conditions. Pinyin is shown as reading support; use the Chinese sentence and translation to confirm the grammar relationship.
他的成绩时好时坏。
His grades fluctuate between good and bad.
小鸟的叫声时长时短。
The bird's calls vary between long and short.
山路时宽时窄，开车要小心。
The mountain road alternates between wide and narrow, so drive carefully.
04 / LIMITS
When to Use It — and When Not To
Use it when
- Describe performance alternating between good and bad.
- Present sound, length, or mood as variable over time.
- State recurring contrast without specifying an exact schedule.
Do not use it when
- Do not omit the second 时.
- Do not use different subjects for A and B inside one compact pattern.
- Do not use it for one irreversible change from A to B.
05 / REPAIR
Compare Right and Wrong
Compare the smallest meaningful change. Each explanation identifies a placement, scope, form, or clause relationship instead of treating the whole sentence as one undifferentiated mistake.
他的成绩时好坏。
他的成绩时好时坏。
The second 时 is omitted
Each alternating state requires its own 时: 时好 and 时坏.
哥哥时高妹妹时矮。
哥哥有时站得高，妹妹有时站得低。
Two subjects are forced into one compact alternation
时A时B describes alternating states of one topic; separate subjects require full clauses with 有时.
他的成绩时好坏。
Each alternating state requires its own 时: 时好 and 时坏.
哥哥时高妹妹时矮。
时A时B describes alternating states of one topic; separate subjects require full clauses with 有时.
06 / PRACTICE
Practice the Grammar Point
Complete three short tasks in order: judge the pattern, repair a common error, and build the sentence. Feedback is fixed and reviewed, so these activities do not use a checker allowance.
1. Judge the sentence
2. Choose the correction
3. Build the sentence
Build a complete sentence with 时A时B.
07 / APPLY
Apply It in Your Sentence
Write one original sentence with 时A时B. Your draft moves to the checker through this browser session, selects this grammar point as the first review focus, and waits for you to submit.
08 / QUESTIONS
时A时B: Alternating from Time to Time Questions
How is 时A时B different from 忽A忽B?
时A时B neutrally marks alternation; 忽A忽B adds a sense of abrupt, unpredictable switching.
Does 时A时B require a regular pattern?
No. It only says that the two states recur at different times.
09 / SOURCES
Sources and Review Notes
These references support different parts of the lesson. GF0025-2021 supports level placement only; professional grammar works support the explanation, limits, examples, and cross-checks. Their inclusion does not imply endorsement.
Chinese Proficiency Grading Standards for International Chinese Language Education (GF0025-2021)
Ministry of Education and State Language Commission · Ministry of Education of the PRC · 2021
Locator: GF0025-2021 Appendix A, combined Levels 7–9 item 【七—九066】, 四字格：时A时B (printed p. 243; PDF page 249)
Supports placement in the official combined Levels 7-9 band; the exact site level remains an internal difficulty label; it does not independently establish the usage explanation.
Official sourceChinese: A Comprehensive Grammar, 2nd ed.
Yip and Rimmington · Routledge · 2016
Locator: Chapter 27, §27.1.4, parallel matching, page 458; Chapter 28, §§28.4.1–28.4.2, quadrisyllabic expressions and idioms, pages 503–507
Supports parallel matching inside fixed quadrisyllabic formations; GF supplies the temporal alternating frame 时A时B.
Official source10 / CONTINUE
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