When do I use 是 vs 有 vs 在?

Use 是 to define or equate two nouns (A is B). Use 有 to say that someone has something or that something exists in a place (there is/are). Use 在 to say where a specific person or thing is located. If you're talking about a person or thing that is already known and you want to give its location, use 在. If you're introducing a new item into a location ('there is something somewhere'), use 有.

Can I use 是 for location like 'I am at home'?

No. English 'to be' includes location, but Chinese uses 在 for that. 'I am at home' is '我在家', never '我是家'.

What about existence — can I say '在书在桌子上'?

No. If you mean 'There is a book on the table' (first mention of the book), you need 有: '桌子上有一本书'. If the book is already known in context, you can say '书在桌子上' (The book is on the table). The first signals existence; the second signals location.

Easily confusedHSK 1

是 vs 有 vs 在: identity, existence/possession, and location

English 'to be' and 'to have' map to three Chinese verbs. 是 (shì) links two nouns as equal (identity, definition, classification). 有 (yǒu) indicates possession or existence of something. 在 (zài) specifies where someone or something is located. Choosing correctly depends on whether you equate, own/exist, or locate.

Chinese uses three different verbs where English often uses a single 'be' or 'have'. Use 是 (shì) to equate or classify two nouns (A is B). Use 有 (yǒu) to indicate possession of an object or the existence of something in a place. Use 在 (zài) to indicate the location of a known subject. The choice depends on what kind of relation you are expressing: identity, possession/existence, or location.

Wann man was verwendet

是shì

to be (copula)

Use 是 to link two nouns when the first equals or belongs to a category defined by the second. It is used for identity, definition, and classification. For example: 'I am a student' (我是学生) or 'This is a book' (这是一本书).

是 is never used before adjectives. Instead, adjectives serve as predicates directly (e.g., 他很忙 – He is busy). Also, 是 is not used for location; use 在 instead.

有yǒu

to have / exist

Use 有 to indicate possession of an object or attribute (e.g., 'I have a cat' – 我有一只猫) or to assert the existence of something in a place (e.g., 'There is a book on the table' – 桌子上有一本书).

有 cannot be used for location of a specific person/thing already mentioned. For that, use 在. Also, 有 can indicate existence without a specific owner (e.g., 'There are many people' – 有很多人).

在zài

to be at / located

Use 在 to specify where a known subject is located. The subject is typically a person, place, or thing that is already established in context. For example: 'He is at home' (他在家) or 'The book is on the table' (书在桌子上).

在 does not mean 'to have' or 'to exist' in the sense of 'there is' – that is 有. 在 always requires a location complement (a place or a directional word).

Auf einen Blick

	是	有	在
Primary function	Links two nouns: identity, classification	Possession or existence of something	Location of a known subject
Subject	First noun = the thing being identified	Typically the possessor or the location phrase	The person/thing whose location is stated
Used with adjectives?	No - adjectives are predicates directly	No - use 很 etc.	No - location only
Example sentence pattern	A + 是 + B	Subject + 有 + Object (or Location + 有 + Noun)	Subject + 在 + Location
Negation	不是 (bú shì)	没有 (méi yǒu)	不在 (bú zài)

Beispiele

是
我是学生。
Wǒ shì xué shēng.
I am a student.
Equating 'I' with 'student' – identity.
有
我有一只猫。
Wǒ yǒu yì zhī māo.
I have a cat.
Possession of an object.
有
桌子上有一本书。
Zhuō zi shàng yǒu yì běn shū.
There is a book on the table.
Existence of an item in a location.
在
他在家。
Tā zài jiā.
He is at home.
Location of a known person.
在
书在桌子上。
Shū zài zhuō zi shàng.
The book is on the table.
Location of a known item (the book is specific).
是
那是我的书吗？
Nà shì wǒ de shū ma?
Is that my book?
Asking about identity.

Häufige Fehler

Using 是 for location: ✗ '我是家' instead of ✓ '我在家' (I am at home).
Using 在 for existence of an unspecified item: ✗ '桌子上在书' instead of ✓ '桌子上有一本书' (There is a book on the table).
Using 有 for identity: ✗ '我有学生' instead of ✓ '我是学生' (I am a student).
Using 是 before an adjective: ✗ '她是漂亮' instead of ✓ '她很漂亮' (She is pretty – use 很 or no copula).
Using 有 to state location of a specific known subject: ✗ '他在家有书' (ambiguous – 'He has a book at home') but for 'He is at home' only 在 is correct.

FAQ

When do I use 是 vs 有 vs 在?: Use 是 to define or equate two nouns (A is B). Use 有 to say that someone has something or that something exists in a place (there is/are). Use 在 to say where a specific person or thing is located. If you're talking about a person or thing that is already known and you want to give its location, use 在. If you're introducing a new item into a location ('there is something somewhere'), use 有.
Can I use 是 for location like 'I am at home'?: No. English 'to be' includes location, but Chinese uses 在 for that. 'I am at home' is '我在家', never '我是家'.
What about existence — can I say '在书在桌子上'?: No. If you mean 'There is a book on the table' (first mention of the book), you need 有: '桌子上有一本书'. If the book is already known in context, you can say '书在桌子上' (The book is on the table). The first signals existence; the second signals location.