When do I use 都 vs 也?

Use 都 to express 'all' or 'both' when you want to say that every member of a group does something or has a property. Use 也 to express 'also' or 'too' when adding an additional item or person to a situation. They are not interchangeable.

Can I use 都 with a singular subject?

Generally no, because 都 refers to a plural set. However, in context where the subject implies a set (e.g., 这个班的学生 'the students of this class' can be singular but implies multiple), but 都 is still only used with plural reference.

Do I always need 都 when the subject is plural?

No. 都 is optional; it is used only when you specifically want to emphasize that the action or state applies to every member of the group. A sentence like 他们是学生 (tāmen shì xuésheng) is perfectly correct and does not require 都.

What is the difference between 都不 and 也不?

都不 means 'none of them' (a total negation of a plural set). 也不 means 'also not' (negation of an additional item). For example, 我们都不去 (wǒmen dōu bù qù) means 'none of us is going'; 他也不去 (tā yě bù qù) means 'he is also not going' (in addition to someone else).

Easily confusedHSK 1

都 vs 也 (dōu vs yě): “all” vs “also”

都 (dōu) means “all” and quantifies over a plural subject or multiple items, expressing totality. 也 (yě) means “also” or “too” and adds an item or situation to a previous one. The two adverbs occupy the same position before the verb and are not interchangeable, though they can combine as 也都 (dōu yě) meaning “all also”.

Both 都 (dōu) and 也 (yě) are adverbs that come before the main verb or adjective in a sentence. 都 indicates “all” or “both”, referring to the entire set of items or people already mentioned. 也 indicates “also”, adding one more element to a situation or statement. While they are often confused by beginners, their meanings are distinct: 都 is about totality, 也 is about addition. Note that 都 is not required just because the subject is plural; it is only used when you want to emphasize that every member of the set does something or has a property.

When to use each

都dōu

all, both

Use 都 to emphasize that every member of a plural subject or multiple items are included in the action or state. For example, when saying “we all like it” or “they are all students”. 都 can also mean “both” when referring to two items. It is optional for plural subjects; you only add it when you want to explicitly express totality.

都 can also appear in the construction 连…都 (lián…dōu) meaning “even”, but that usage is more advanced (HSK 4+).

也yě

also, too

Use 也 to indicate that something additional applies to the subject or situation, often in response to or in parallel with a previous statement. For example, “I also like coffee” after someone says they like tea. 也 can also mean “too” in affirmative sentences and “neither/either” in negative sentences (e.g., 我也不去 “I’m also not going”).

When 也 appears together with 都 as 也都 (dōu yě), it means “all also”, combining totality and addition.

At a glance

	都	也
Core meaning	All / both (totality)	Also / too (addition)
Requires a plural or multiple items?	Yes—都 refers to a set of two or more items.	No—也 can be used with singular or plural subjects.
Position in sentence	Before the verb or adjective.	Before the verb or adjective.
Negation	都不 (dōu bù) means “all not” (none of them does something).	也不 (yě bù) means “also not” (neither/nor).
Can combine?	Yes, with 也 to form 也都 (dōu yě) 'all also'.	—

Examples

都
我们都喜欢喝茶。
Wǒmen dōu xǐhuān hē chá.
We all like to drink tea.
都 emphasizes that every one of 'us' likes tea.
也
我也喜欢喝茶。
Wǒ yě xǐhuān hē chá.
I also like to drink tea.
也 adds the speaker to a set of people who like tea.
都
他们都不是学生。
Tāmen dōu bù shì xuésheng.
None of them are students. (All are not students.)
都不 means 'all not'.
也
他不是学生，我也不是。
Tā bù shì xuésheng, wǒ yě bù shì.
He is not a student, and I am not either.
也不 means 'also not'.
都
他们也都是老师。
Tāmen dōu yě shì lǎoshī.
They are all also teachers.
Combination of 都 and 也: all of them additionally.

Common mistakes

Using 也 when you mean 'all' (e.g., 我们也是学生 for 'we are all students'—incorrect; should be 我们都是学生).
Using 都 for 'also' (e.g., 我都喜欢咖啡 for 'I also like coffee'—incorrect; should be 我也喜欢咖啡).
Omitting 都 when totality is needed (e.g., 他们喜欢茶 for 'they all like tea'—ambiguous; 都 clarifies 'all').
Adding 都 unnecessarily to every plural subject (e.g., 我们都吃饭 when you simply mean 'we eat' without emphasis—acceptable but often unnatural; 都 is only for emphasis of 'all').

FAQ

When do I use 都 vs 也?: Use 都 to express 'all' or 'both' when you want to say that every member of a group does something or has a property. Use 也 to express 'also' or 'too' when adding an additional item or person to a situation. They are not interchangeable.
Can I use 都 with a singular subject?: Generally no, because 都 refers to a plural set. However, in context where the subject implies a set (e.g., 这个班的学生 'the students of this class' can be singular but implies multiple), but 都 is still only used with plural reference.
Do I always need 都 when the subject is plural?: No. 都 is optional; it is used only when you specifically want to emphasize that the action or state applies to every member of the group. A sentence like 他们是学生 (tāmen shì xuésheng) is perfectly correct and does not require 都.
What is the difference between 都不 and 也不?: 都不 means 'none of them' (a total negation of a plural set). 也不 means 'also not' (negation of an additional item). For example, 我们都不去 (wǒmen dōu bù qù) means 'none of us is going'; 他也不去 (tā yě bù qù) means 'he is also not going' (in addition to someone else).