GRAMMAR IN PRACTICE
Chinese comparisons: 比、没有 and 不比 with practice
A basic comparison is A + 比 + B + adjective: 这条路比那条路短. Keep the direction of comparison clear. A 不比 B 贵 denies that A is more expensive; A 没有 B 贵 says A is less expensive. These are different claims.
Choose one property and one direction
If a blue notebook costs eighteen yuan and a green one costs twelve, 蓝色的笔记本比绿色的贵 describes price. Switching the two objects requires switching 贵 to 便宜. Swapping only the names reverses the fact.
In the basic 比 pattern, do not add 很 immediately before the adjective to mean a large difference. You can say 贵很多 or 贵六元 after it. 更 can have a comparative role in context, so avoid the broader claim that no adverb can ever occur in a comparison.
Do not strengthen a negative claim
不比 rejects a proposed greater degree. If two bags both weigh one kilogram, 这个包不比那个重 is true, while 这个包没有那个重 would say this bag is lighter. Equality exposes why the two negatives cannot always replace each other.
Keep the measurement attached to the property
贵六元 gives a price difference; 长十厘米 gives a length difference. A difference without a unit may be unclear. When summarizing a chart or a listening passage, preserve both the direction and the unit instead of adding an unsupported “much”.
Original examples: understand, then adapt
1. 蓝色的笔记本比绿色的贵六元。
Lánsè de bǐjìběn bǐ lǜsè de guì liù yuán.
The blue notebook costs six yuan more than the green one.
The price difference follows 贵.
Compare structure, meaning and other valid expressions
绿色的笔记本比蓝色的贵六元。
Swapping only the objects reverses the price fact. To swap them faithfully, use 便宜六元.
2. 这条小路没有大路宽。
Zhè tiáo xiǎolù méiyǒu dàlù kuān.
This path is not as wide as the main road.
没有 describes a lower degree of width.
Compare structure, meaning and other valid expressions
这条小路不比大路宽。
This weaker claim allows equal width. 没有 in the original specifically says the path is narrower.
3. 这个包不比那个重。
Zhège bāo bù bǐ nàge zhòng.
This bag is no heavier than that one.
It denies greater weight; equal weight remains possible.
Compare structure, meaning and other valid expressions
这个包没有那个重。
This states that the bag is lighter. It rules out the equality still allowed by 不比.
4. 这根绳子比那根长十厘米。
Zhè gēn shéngzi bǐ nà gēn cháng shí límǐ.
This rope is ten centimetres longer than that one.
The difference and length unit follow 长.
Compare structure, meaning and other valid expressions
这根绳子比那根十厘米长。
For this simple difference pattern, put 十厘米 after 长. This is not the same structure as describing a rope that is ten centimetres long.
5. 这两间教室一样大。
Zhè liǎng jiān jiàoshì yíyàng dà.
These two classrooms are the same size.
一样 states equality directly.
Compare structure, meaning and other valid expressions
第一间教室没有第二间大。
This states inequality. It cannot preserve the fact that the rooms are equally large.
6. 今天比昨天暖和一点儿。
Jīntiān bǐ zuótiān nuǎnhuo yìdiǎnr.
It is a little warmer today than yesterday.
一点儿 specifies a small difference.
Compare structure, meaning and other valid expressions
今天比昨天暖和得多。
This is grammatical but claims a much larger difference. It is a meaning change, not a minimal correction.
Answer first, then check the reasoning
1. Blue: 18 yuan. Green: 12 yuan. Complete 蓝色的比绿色的贵___。
Answer and explanation
六元. Subtract twelve from eighteen. 十八元 is the blue price, not the difference; 六个 uses the wrong unit.
2. Two rooms are exactly the same size. Which fits: A 不比 B 大 or A 没有 B 大?
Answer and explanation
A 不比 B 大 fits: A is not larger. A 没有 B 大 asserts that A is smaller, contradicting equality. A 跟 B 一样大 is the clearest direct statement.
3. The learner means “much colder today”. Correct: 今天比昨天很冷。
Answer and explanation
今天比昨天冷很多, or 今天比昨天冷得多. Place the degree difference after 冷. Simply deleting 很 would lose the intended large difference.
4. Bag A costs 80 yuan and bag B costs 95 yuan. Complete A 比 B ___ and B 比 A ___. Include the price difference.
Answer and explanation
A 比 B 便宜十五元；B 比 A 贵十五元。The amount stays fifteen while the comparison direction and adjective change together.
Change the conditions and make it yours
Bus A takes 25 minutes; bus B takes 40. Compare travel time, state the fifteen-minute difference, then explain why that does not prove A costs less.
Show one possible response
坐 A 比坐 B 少用十五分钟。A 的车程更短，但题目没有提供票价，不能判断哪个更便宜。
Compare time with time, keep minutes as the unit, and do not infer a price from travel duration.
Sources and verification
References checked:
Take the practice with you
Print for personal study or classroom practice, keeping the source credit. Reference expressions are not the only possible answers. These are not official exam papers or an AI accuracy benchmark.
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