When do I use 正 vs 在 for ongoing actions?

Use 在 as the standard progressive marker for any ongoing action. Use 正 only when you want to emphasize that the action is happening at a specific moment or coincides with another event, and always pair it with 在 or 着 (e.g., 我正在做饭 rather than 我正做饭).

Can 正 be used alone as a progressive marker?

No. 正 alone means 'exactly' or 'just now' (e.g., 正六点 'exactly six o'clock') and cannot indicate an action in progress. For a progressive meaning, combine 正 with 在 (正在) or 着 (正…着).

What is the difference between 正在 and 在?

在 is a neutral progressive marker. 正在 adds emphasis on the exact moment, often used with time expressions or to show that the action is happening 'right now' or coincides with another action. They are often interchangeable, but 正在 is more emphatic and cannot be negated (negation uses 没在).

How do I say 'I am about to...' using 正?

Use 正要 + verb (e.g., 我正要出去 'I am about to go out'). This indicates an imminent action, not a progressive one. For progressive, use 正在 or 在.

Easily confusedHSK 3

正 vs 在 (zhèng vs zài): progressive markers for time and aspect

正 and 在 both relate to ongoing actions, but they serve different roles. 在 is the standard progressive marker, placed before verbs to indicate an action in progress. 正 is an adverb that emphasizes the precise moment or coincidence of an action; it is not used alone as a progressive marker but often combines with 在 (forming 正在) or 着 to create a progressive sense. Learners often misuse 正 alone for progressive aspect.

In Mandarin, 在 is the primary marker for the progressive aspect, equivalent to English '-ing'. It is placed before the verb to show an action is ongoing. 正, on the other hand, is an adverb that stresses the exact moment or coincidence of an action; it is not a standalone progressive marker. Instead, 正 is often paired with 在 (as 正在) or with 着 to form a progressive construction that adds temporal precision. Additionally, 正 can combine with 要 (正要) to indicate an action about to happen. Understanding this distinction helps avoid the common error of using 正 alone for progressive meaning.

When to use each

正zhèng

right at (moment)

Use 正 to emphasize that an action is occurring at a specific moment, often with a time expression or to indicate coincidence. It is commonly paired with 在 (to form 正在) or 着 to indicate progressive aspect. 正 alone is not grammatical as a progressive marker; it functions as an adverb meaning 'just now' or 'exactly'. It can also be used with 要 (正要) to express an imminent action.

正 is not a progressive marker by itself; it must co-occur with 在 or 着 for progressive meaning. Without them, 正 typically means 'exactly' or 'just' and is used with time words (e.g., 正六点 'exactly six o'clock').

在zài

in progress

Use 在 as the primary progressive aspect marker in Chinese, placed before verbs to indicate an ongoing action. It is versatile and can be used without additional time references. 在 can stand alone as a progressive marker in affirmative, negative, and question forms (e.g., 我在吃饭 'I am eating'). It can also be negated with 没 (没在).

At a glance

	正	在
Core meaning	Emphasizes precise moment / coincidence	Marks ongoing action
Standalone progressive marker?	No – must combine with 在 or 着	Yes – used alone before verbs
Common collocations	正在, 正…着, 正要	在 + verb, 没在 + verb
Temporal nuance	Adds 'just at that moment' focus	Neutral progressive aspect
Negation	不正在? (rare; usually 没在 with 正在)	没在 (standard negation for progressive)

Examples

正
我正在吃饭。
Wǒ zhèngzài chīfàn.
I am eating (right at this moment).
正 combines with 在 (正在) to emphasize the exact moment.
在
我在吃饭。
Wǒ zài chīfàn.
I am eating.
在 alone marks ongoing action without temporal emphasis.
正
他正看着电视。
Tā zhèng kànzhe diànshì.
He is watching TV (at that very moment).
正 with 着 emphasizes the precise moment of the action.
正
他正在看书。
Tā zhèngzài kàn shū.
He is reading a book (right now).
正在 combines the progressive aspect with temporal focus.
在
我没在睡觉。
Wǒ méi zài shuìjiào.
I am not sleeping.
Negation of progressive: 没在 + verb.
正
✗我正吃饭。
Wǒ zhèng chīfàn.
(intended: I am eating)
✗ Incorrect – 正 alone cannot be used as a progressive marker; use 正在 or 在.

Common mistakes

Using 正 alone as a progressive marker (e.g., 我正吃饭) – should be 我正在吃饭 or 我正吃着饭.
Confusing 正 with 正在, thinking they are interchangeable in all contexts (正 requires 在 or 着 for progressive).
Omitting 在 when using 正 as a simple progressive (e.g., 他正走 – should be 他正在走 or 他正走着).
Using 在 for immediate future actions (e.g., 我在要走 for 'I am about to leave') – use 正要 instead.

FAQ

When do I use 正 vs 在 for ongoing actions?: Use 在 as the standard progressive marker for any ongoing action. Use 正 only when you want to emphasize that the action is happening at a specific moment or coincides with another event, and always pair it with 在 or 着 (e.g., 我正在做饭 rather than 我正做饭).
Can 正 be used alone as a progressive marker?: No. 正 alone means 'exactly' or 'just now' (e.g., 正六点 'exactly six o'clock') and cannot indicate an action in progress. For a progressive meaning, combine 正 with 在 (正在) or 着 (正…着).
What is the difference between 正在 and 在?: 在 is a neutral progressive marker. 正在 adds emphasis on the exact moment, often used with time expressions or to show that the action is happening 'right now' or coincides with another action. They are often interchangeable, but 正在 is more emphatic and cannot be negated (negation uses 没在).
How do I say 'I am about to...' using 正?: Use 正要 + verb (e.g., 我正要出去 'I am about to go out'). This indicates an imminent action, not a progressive one. For progressive, use 正在 or 在.