是 vs 有 (shì vs yǒu): identity vs possession
是 (shì) connects two nouns to define identity or classification (e.g., 'is a doctor'), while 有 (yǒu) indicates possession or existence (e.g., 'has a car'). For stating age, neither verb is used in standard Mandarin; simply say 'subject + number + 岁'. Confusingly, English uses 'to be' for age, but Chinese does not.
是 (shì) and 有 (yǒu) are both common verbs, but they serve different functions. 是 marks identity, equivalence, or classification (A is B). 有 marks possession (A has B) or existence (there is B). A common pitfall is age: English says 'I am 20 years old', but Chinese does not use 是 or 有; the standard expression is simply 'subject + 20 + 岁' (e.g., 我二十岁). 是 can appear in age statements for emphasis (e.g., 他是二十岁, 'He IS twenty'), but this is not the neutral form. 有 is never used for age.
Quando usar cada um
Use 是 to link two noun phrases that are equivalent or to classify something (e.g., 他是老师 'He is a teacher'). It is also used with age only when emphasizing certainty or confirming a fact, not in neutral statements. For negation, use 不是.
In age statements, 是 can sound emphatic or contrastive (e.g., 他是二十岁, not twenty-one). Avoid overusing it in casual contexts.
Use 有 to indicate possession (e.g., 他有一辆车 'He has a car') or existence (e.g., 有问题 'There is a problem'). Do not use 有 for inherent attributes like age, height, or size—those are expressed as noun predicates without a verb. For negation of possession, use 没有.
有 can also express 'there is/are' when the subject is a place or time (e.g., 桌子上有一本书 'There is a book on the table').
Visão geral
| 是 | 有 | |
|---|---|---|
| Core meaning | Identity / classification (A = B) | Possession / existence (A has B / there is B) |
| Age statement (neutral) | Not used (standard: 他二十岁); can be used for emphasis | Never used |
| Negation | 不是 (bùshì) | 没有 (méiyǒu) |
| Question form | 是吗？/是不是？ | 有吗？/有没有？ |
| Can link two nouns? | Yes | No (has different syntax) |
Exemplos
- 是他是医生。Tā shì yī shēng.He is a doctor.Identity: 是 connects two nouns.
- 有他有一辆车。Tā yǒu yí liàng chē.He has a car.Possession: 有 indicates ownership.
- 我二十岁。Wǒ èr shí suì.I am twenty years old.No verb needed. This is standard for age.
- 是他是二十岁，不是十八岁。Tā shì èr shí suì, bú shì shí bā suì.He IS twenty, not eighteen.是 used for emphasis/correction. Neutral would be '他二十岁'. Not a contradiction: 是 is allowed here.
- 有她没有钱。Tā méi yǒu qián.She doesn't have money.Negation of 有 uses 没有.
Erros comuns
- Using 是 in neutral age statements: '我是二十岁' is unnatural; use '我二十岁'.
- Using 有 for age: '他有二十岁' is incorrect for stating age.
- Using 有 for identity: '他有医生' means 'He has a doctor', which is wrong unless he possesses a doctor.
- Using 是 for possession: '他是车' means 'He is a car', not 'He has a car'.
Perguntas frequentes
- When do I use 是 vs 有 for age?
- Neither is used for neutral age statements. Standard Chinese says 'subject + number + 岁' (e.g., '他二十岁'). 是 can be used for emphasis (e.g., '他是二十岁' meaning he is indeed twenty), and 有 is never used for age. So if you are simply stating your age, use no verb. If you need to stress correctness, 是 is okay.
- Can I use 有 to talk about my height or weight?
- No. Height (身高) and weight (体重) are expressed like age: 'subject + number + measure word' (e.g., '他一米八' for height). Do not use 有 or 是. However, you can say '我有…' when talking about having a certain amount of something, e.g., '我有两本书' (I have two books), but not for attributes.
- What is the difference between 是 and 有 in questions?
- Yes/no questions for 是 use 是吗？ or 是不是？ For 有 use 有吗？ or 有没有？ For example, '他是老师吗？' (Is he a teacher?) vs '他有车吗？' (Does he have a car?).
- Is '他有两岁' ever correct?
- No, '他有两岁' is not standard for stating his age. It might be interpreted as 'He has two years' (e.g., as a length of time) in an unusual context, but for age, always use '他两岁' or '他是两岁' (emphatic).