English lets one phrase — "just now" — cover both "I just arrived" and "who came just now?" Chinese splits that job across two words with different grammatical categories, and that category difference is the whole game. 刚 is an adverb: it can only stand directly in front of a verb, describing how recently the action happened. 刚才 is a time noun: it names the recent-past moment itself, so it behaves like any time word — it can head the sentence, be the subject of a question, or take 的 to modify a noun. Confuse their slots and you'll produce sentences that feel like putting an adverb where a noun belongs. Both interact with the perfective 了, covered on 了 the perfective.
The core split: adverb vs time noun
| 刚 (gāng) | 刚才 (gāngcái) | |
|---|---|---|
| Part of speech | adverb | time noun |
| Position | only right before the verb | flexible: sentence-front, subject, after 的 |
| Can take 的? | no (*刚的事) | yes (刚才的事) |
| Can be the subject/topic? | no | yes (刚才谁来了？) |
| Feel | subjective "a moment ago" | objective recent moment |
刚: the adverb, welded to the verb
刚 sits immediately before the verb and stresses that the action happened only moments ago. Because 刚 already signals recency and completion, the sentence often needs no 了 at all — 他刚走 "he just left" is complete on its own. 刚 can also pair with a short following span to say how long ago something began (刚来两天 "arrived just two days ago").
我刚到，你在哪儿？
wǒ gāng dào, nǐ zài nǎr?
I just got here — where are you? (informal) — 刚 directly before 到.
他刚走，你追出去还来得及。
tā gāng zǒu, nǐ zhuī chūqù hái láidejí
He just left — if you run after him you can still catch him. (informal) — 刚走 needs no 了.
他刚来两天，还不太熟悉环境。
tā gāng lái liǎng tiān, hái bú tài shúxī huánjìng
He arrived just two days ago and isn't familiar with things yet. (informal) — 刚 + a short span.
刚才: the time noun, naming the moment
刚才 refers to a definite, objectively recent past moment (usually seconds to minutes ago). As a time word it roams: it can open the sentence, sit as the subject of a question, or attach to a noun with 的. When 刚才 reports a completed action, that clause typically carries 了.
刚才谁给我打电话了？
gāngcái shéi gěi wǒ dǎ diànhuà le?
Who just called me? (informal) — 刚才 fronts a question; 刚 could never sit here.
刚才我在开会，没看手机。
gāngcái wǒ zài kāihuì, méi kàn shǒujī
I was in a meeting just now, didn't check my phone. (informal) — 刚才 before the subject.
刚才的事你别放在心上，他不是故意的。
gāngcái de shì nǐ bié fàng zài xīn shàng, tā bú shì gùyì de
Don't take that thing just now to heart — he didn't mean it. (informal) — 刚才 + 的 modifying 事.
你刚才说什么？我没听清。
nǐ gāngcái shuō shénme? wǒ méi tīng qīng
What did you say just now? I didn't catch it. (informal) — the standard 'just now' for a recent utterance.
Seeing them side by side
The clearest way to feel the difference is to build the same idea both ways. With 刚 the recency rides on the verb; with 刚才 it lives in a movable time word.
我刚吃完饭，先不喝了。
wǒ gāng chī wán fàn, xiān bù hē le
I've just finished eating — I'll skip a drink for now. (informal) — adverb 刚 on the verb.
刚才我还在这儿，怎么一转眼就不见了？
gāngcái wǒ hái zài zhèr, zěnme yì zhuǎnyǎn jiù bújiàn le?
It was right here just now — how did it vanish in the blink of an eye? (informal) — time noun 刚才 as the anchor.
A note on 刚刚: the reduplicated 刚刚 is a common intensified variant of the adverb 刚 ("just this instant"), and colloquially it edges toward a time-word use too — but treat it as 刚's cousin, not 刚才's.
Common Mistakes
1. Using 刚 as a standalone time word or subject. 刚 can't front a sentence or be the subject of a question; that's 刚才's job.
❌ 刚谁来了？
Wrong — 刚 can't stand as a time word; say 刚才谁来了？
✅ 刚才谁来了？
gāngcái shéi lái le?
Who came just now? — 刚才 as subject-position time word.
2. Giving 刚 the 的 that only 刚才 takes. To modify a noun, you need the time noun.
❌ 刚的事我们再谈。
Wrong — 刚 can't take 的; say 刚才的事我们再谈。
✅ 刚才的事我们再谈。
gāngcái de shì wǒmen zài tán
Let's talk about that matter from just now later. — 刚才的 modifying 事.
3. Using 刚才 in the pure recency slot where 刚 belongs. For "he just (this instant) left," the natural form is the adverb 刚 on the verb; a bare 刚才 + verb without 了 sounds unfinished.
❌ 他刚才走。
Sounds unfinished — say 他刚走 (just left) or 他刚才走了 (left just now).
✅ 他刚走，可能还没到电梯。
tā gāng zǒu, kěnéng hái méi dào diàntī
He just left, probably hasn't reached the elevator yet. — adverb 刚 for pure recency.
4. Placing the adverb 刚 after the verb (English word order). 刚 must precede the verb.
❌ 我到刚了。
Wrong order — the adverb goes before the verb: 我刚到。
✅ 我刚到，马上上来。
wǒ gāng dào, mǎshàng shànglái
I just arrived, coming up right away. — 刚 before 到.
Key Takeaways
- 刚 = adverb "just," locked right before the verb (我刚到); often needs no 了.
- 刚才 = time noun "just now," free to front the sentence, be the subject, or take 的 (刚才谁来了？刚才的事).
- Only 刚才 takes 的 and can be a standalone time word; 刚 can do neither.
- When 刚才 reports a completed action, the clause usually carries 了.
- Test: if a full time phrase like "五分钟前" fits the slot, use 刚才; if the word is glued to the verb, use 刚.
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- The Perfective 了 (le₁): Completed ActionHSK 1 — The verb-suffix 了 (le₁) sits right after the verb and marks the action as completed or realized — 我吃了饭, 买了三本书. It is completion aspect, not past tense, so it can even point to the future: 下了课就走.