When do I use 刚 vs 刚刚?

Use 刚 for neutral statements about something that happened recently. Use 刚刚 when you want to emphasize that it happened mere moments ago, or in fixed expressions like 刚刚好 (just right). In many cases they are interchangeable, but 刚刚 adds a slightly stronger sense of immediacy.

Can 刚 and 刚刚 be used with 了?

Yes, both can appear with 了 to mark a completed action. Example: 我刚吃了早饭 (I just ate breakfast). 刚刚 also works: 他刚刚走了 (He just left). The 了 emphasizes completion, while the adverb focuses on the recentness.

Is 刚刚 always interchangeable with 刚?

No. 刚刚 has an additional meaning of “exactly” in certain contexts, such as 刚刚十点 (exactly ten o’clock) or 刚刚好 (just right). In those uses, 刚 cannot replace 刚刚. Otherwise, for temporal “just,” they are largely interchangeable with a slight difference in emphasis.

What is the difference between 刚 and 刚才?

刚 (or 刚刚) is an adverb placed before the verb to indicate recency, e.g., 我刚来 (I just arrived). 刚才 is a noun-like time word meaning “a moment ago” and can sit before or after the subject, e.g., 刚才他来电话了 (He called a moment ago). 刚才 often implies a past action that is now finished, while 刚 stresses the recency of the action.

Easily confusedHSK 3

刚 vs 刚刚 (gāng vs gānggāng): “just” adverbs

刚 (gāng) and 刚刚 (gānggāng) both mean “just (recently)” and are often interchangeable in casual speech. 刚刚 is the reduplicated form of 刚, adding slight emphasis or formality, and can also mean “exactly/precisely” in certain fixed expressions. For most temporal uses, 刚 is neutral while 刚刚 stresses that the event occurred a very short moment ago.

Both 刚 (gāng) and 刚刚 (gānggāng) are time adverbs placed before the verb to indicate that an action happened “just” a short while ago. The core difference is emphasis: 刚 is the standard, neutral form, while 刚刚 adds a layer of immediacy or formality, often implying a more precise or very recent moment. In many everyday contexts they can be swapped without changing the core meaning, but 刚刚 is also used adverbially to mean “exactly” in phrases like 刚刚好 (gānggāng hǎo, “just right”). Learners should start with 刚 for most past-time references and reserve 刚刚 for when extra clarity or stress on the recency is desired.

When to use each

刚gāng

just (adverb)

Use 刚 as the default adverb to express that an action happened a short while ago. It is neutral, concise, and suits both spoken and written language. For example: 我刚起床 (wǒ gāng qǐchuáng, I just got up).

刚刚gānggāng

just now / exactly

Use 刚刚 to emphasize that the action occurred in the very recent past, often moments ago. It can also appear in the fixed expression 刚刚好 (gānggāng hǎo) meaning “just right.” 刚刚 is slightly more formal or emphatic than 刚, though in casual speech they are frequently interchangeable.

In some dialects or very casual speech, 刚刚 is preferred for immediate past (just seconds ago), while 刚 can cover a slightly broader window (minutes to hours). Additionally, 刚刚 can modify adjectives in the sense of “exactly”: 刚刚十点 (gānggāng shí diǎn, exactly ten o’clock), though that usage is less common.

At a glance

	刚	刚刚
Emphasis on recency	Neutral; often leaves the exact timeframe unspecified.	Stronger; typically implies a very short time ago (seconds or minutes).
Meaning outside “just”	Only used as an adverb meaning “just (recently).”	Also means “exactly” in fixed phrases like 刚刚好.
Formality/register	Neutral, common in all registers.	Slightly more formal or emphatic; can sound more deliberate.
Negation	Used with 没有 or 不: 刚没有…… is unusual; prefer 刚才没有…… or 刚刚没有…….	同样可以用没有：刚刚没有下雨 (gānggāng méiyǒu xià yǔ, it didn't rain just now).

Examples

刚
我刚吃完午饭。
Wǒ gāng chī wán wǔfàn.
I just finished lunch.
Neutral statement; 刚刚 would also work but adds extra emphasis on recency.
刚刚
他刚刚出门，你追上去还能见到他。
Tā gānggāng chūmén, nǐ zhuī shàng qù hái néng jiàn dào tā.
He just went out (just moments ago); if you run after him, you can still see him.
刚刚 stresses that the departure happened very recently, making the advice to chase him more logical.
刚刚
这件衣服不大不小，刚刚好。
Zhè jiàn yīfu bù dà bù xiǎo, gānggāng hǎo.
This piece of clothing is neither big nor small; it’s just right.
Fixed expression 刚刚好 (exactly right); 刚 cannot replace 刚刚 here.
刚
你们刚认识，别太着急。
Nǐmen gāng rènshi, bié tài zhāojí.
You just met; don’t be too anxious.
Natural use of 刚; 刚刚 would be overly emphatic but still acceptable.
刚刚
刚刚下了一场雨，地面还是湿的。
Gānggāng xià le yī chǎng yǔ, dìmiàn hái shì shī de.
It just rained (a short while ago); the ground is still wet.
刚 would also be fine, but 刚刚 better conveys that the rain ended moments ago.

Common mistakes

Using 刚 in place of 刚刚 in the fixed expression 刚刚好 – should be 刚刚, not 刚. Wrong: *这件衣服刚好 (may be understood as “just fine” but less common; actually 刚好 is acceptable for “just right” as well, but 刚刚好 is more standard for “exactly right”).
Assuming 刚 can always replace 刚刚 – while often true, 刚刚 can mean “exactly” in time expressions like 刚刚十点, where 刚 cannot substitute. Wrong: *刚十点.
Overusing 刚刚 in neutral contexts where 刚 suffices, making speech sound unnaturally emphatic or formal.
Confusing 刚 with 刚才 (gāngcái, “a moment ago”). 刚 is an adverb before the verb, while 刚才 can be used as a time noun and often implies a past action that is already complete. Wrong: *我刚在做了作业 (should be 我刚才做了作业 or 我刚做完作业).

FAQ

When do I use 刚 vs 刚刚?: Use 刚 for neutral statements about something that happened recently. Use 刚刚 when you want to emphasize that it happened mere moments ago, or in fixed expressions like 刚刚好 (just right). In many cases they are interchangeable, but 刚刚 adds a slightly stronger sense of immediacy.
Can 刚 and 刚刚 be used with 了?: Yes, both can appear with 了 to mark a completed action. Example: 我刚吃了早饭 (I just ate breakfast). 刚刚 also works: 他刚刚走了 (He just left). The 了 emphasizes completion, while the adverb focuses on the recentness.
Is 刚刚 always interchangeable with 刚?: No. 刚刚 has an additional meaning of “exactly” in certain contexts, such as 刚刚十点 (exactly ten o’clock) or 刚刚好 (just right). In those uses, 刚 cannot replace 刚刚. Otherwise, for temporal “just,” they are largely interchangeable with a slight difference in emphasis.
What is the difference between 刚 and 刚才?: 刚 (or 刚刚) is an adverb placed before the verb to indicate recency, e.g., 我刚来 (I just arrived). 刚才 is a noun-like time word meaning “a moment ago” and can sit before or after the subject, e.g., 刚才他来电话了 (He called a moment ago). 刚才 often implies a past action that is now finished, while 刚 stresses the recency of the action.