Chinese Marks Aspect, Not Tense | Chinese (Mandarin) Grammar

This is the single most important idea in the whole Aspect group, so it comes first. Chinese verbs do not change for time. There is no "eat / ate / eaten," no "-ed," no "will" glued to the verb. The word 吃 (chī, eat) is 吃 whether the eating is yesterday, right now, or next year. What Chinese does mark — with little particles like 了, 过 and 着 — is aspect: the internal shape of an event. Is it finished? Is it a past experience you've collected? Is it in progress? That is a completely different question from when it happened, and once you separate the two, a huge amount of Chinese stops feeling mysterious. English fuses "when" and "shape" into one verb ending; Chinese keeps them apart, handing "when" to time words and "shape" to aspect particles.

Tense versus aspect: two different questions

English speakers are trained to ask "when?" and answer by changing the verb. Chinese asks "what shape?" and answers by adding a particle while leaving the verb untouched. Watch the verb 吃 stay perfectly constant while the aspect particle does all the work:

English (tense on the verb)	Chinese (aspect particle, verb constant)	Viewpoint
I eat	我吃	neutral, no shape marked
I ate / I've eaten	我吃了	completed (perfective)
I have eaten (before)	我吃过	experiential — done at least once
I am eating	我在吃	progressive — in progress
I will eat	我(明天)吃	no change — time word carries it

The verb never moves. Only the particle changes, and each particle answers "what shape is this event?" — not "what time is it?"

我吃饭。

wǒ chī fàn

I eat. / I'm eating. (neutral) — bare verb, no aspect marked; the shape is left open.

我吃了饭。

wǒ chī le fàn

I ate. / I've eaten. (informal) — 了 marks the eating as completed.

我吃过日本菜。

wǒ chī guo Rìběn cài

I've eaten Japanese food (at some point). (neutral) — 过 marks it as an experience collected, not a specific time.

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Retrain the question in your head. Don't ask "should this verb be past or future?" — the verb can't be either. Ask "is this action complete (了), an experience (过), or in progress (在/着)?" That is the only choice aspect gives you.

Time comes from time words, not the verb

If the verb doesn't carry "when," something has to — and that something is a time word: 昨天 (yesterday), 明天 (tomorrow), 现在 (now), 去年 (last year), 那时候 (back then). Flip only the time word and the exact same verb serves past and future alike:

我昨天去北京。

wǒ zuótiān qù Běijīng

I went to Beijing yesterday. (neutral) — past is carried entirely by 昨天; 去 is unchanged.

我明天去北京。

wǒ míngtiān qù Běijīng

I'm going to Beijing tomorrow. (neutral) — same verb 去; only 昨天 → 明天 changes the time.

This is why a Chinese verb list has no conjugation columns — there is nothing to conjugate. For the full picture of that, see verbs don't conjugate. For how to actually talk about past events in practice, see the companion page how to express the past.

Aspect describes the event's inner shape

Because aspect is about shape rather than time, the same particle works across all times. 过 marks "have experienced this" whether the experience was last week or as a child; 着 marks a state as holding whether the scene is present or narrated in the past; 在 marks in-progress-ness at any point on the timeline.

我在吃饭，等一下。

wǒ zài chī fàn, děng yíxià

I'm eating, hold on a sec. (informal) — 在 marks the eating as ongoing right now.

门开着，你进来吧。

mén kāi zhe, nǐ jìnlai ba

The door's open, come on in. (informal) — 着 marks 开 as a state that's holding, not an event.

她笑着跟我说了再见。

tā xiào zhe gēn wǒ shuō le zàijiàn

She said goodbye to me with a smile. (neutral) — 着 (ongoing manner 'smiling') and 了 (completed 'said') coexist, because each marks shape, not time.

你看过这部电影吗？

nǐ kàn guo zhè bù diànyǐng ma?

Have you (ever) seen this movie? (informal) — 过 asks about experience, saying nothing about when.

That last pair is the proof: 着 and 了 sit in the same past sentence without contradiction, because they aren't both fighting over "when" — one says "this was ongoing," the other says "this was completed." Tense could never let two conflicting time-stamps share a clause; aspect welcomes it.

Common Mistakes

1. Reading 了 as the past tense "-ed". 了 marks completion, not pastness. Slapping it onto a past state is the classic beginner error — states have no completion point.

❌ 我以前很胖了。

Incorrect for 'I used to be fat' — 很胖 is a state, not a completed event, so no 了. (胖了 would mean 'has gotten fat' now.)

✅ 我以前很胖。

wǒ yǐqián hěn pàng

I used to be fat. — a past state takes no aspect marker; 以前 carries the time.

2. Adding 了 to a future plan because it feels 'definite'. Future events take no completion marker; the time word does the job.

❌ 我明天去了公园。

Incorrect — a future event isn't completed, so no 了; 明天 already sets the time.

✅ 我明天去公园。

wǒ míngtiān qù gōngyuán

I'm going to the park tomorrow. — verb unchanged, time from 明天.

3. Using 过 for a specific past event. 过 means "have experienced," not simple "-ed." For a particular completed event, use 了.

❌ 我昨天去过学校。

Odd for 'I went to school yesterday' — 过 = 'have been to (ever)', which clashes with the specific 昨天.

✅ 我昨天去了学校。

wǒ zuótiān qù le xuéxiào

I went to school yesterday. — a specific completed event takes 了, not 过.

Key Takeaways

Chinese has no tense: the verb never changes for past, present or future.
What it marks is aspect — the shape of the event: completed (了), experienced (过), ongoing (在 / 着).
When an event happens comes from time words (昨天, 明天, 那时候), never from the verb.
Aspect and time are independent, so a past sentence and a future sentence can share the identical verb (昨天去 / 明天去).
Retrain your instinct: stop hunting for a verb ending; ask "complete, experienced, or in progress?" — and beware equating 了 with "-ed", the number-one aspect mistake.

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