How to use ‘了 (le)’ in Mandarin Chinese

English speakers often treat 了 le like the past-tense ending “-ed.” That shortcut works sometimes — and fails often. Mandarin marks aspect (whether an action is finished or a situation has changed), not tense the way English does.

This guide merges the classic GoEast explainer with exclusive teaching patterns from the GoEast Research Team, so you can place 了 le correctly for completed actions, new situations, double-了 sentences, and the negation traps that trip most beginners.

The two 了s: completion vs change

Mandarin learners meet one character — 了 — that does two different jobs. Naming them separately is the fastest way to stop guessing.

了₁ — How to use 了 for completed actions

了₁ sits after the verb and stamps the action as done. Chinese verbs do not conjugate; 了 le carries the “finished” signal that English builds into ate / bought / watched.

Pattern A — Simple completion (no number)

When you are only reporting that something happened — no amount — 了 often sits at the end of the verb–object phrase:

Subject + Verb + Object + 了

• 她吃饭了。 Tā chī fàn le. — She ate. / She’s eaten.
• 我去商店了。 Wǒ qù shāngdiàn le. — I went to the store.
• 你买什么了？ Nǐ mǎi shénme le? — What did you buy?

Pattern B — Completion with a number (了 moves)

GoEast Research Team rule: when you add a specific quantity, 了 jumps to right after the verb so the number can sit cleanly before the object.

Subject + Verb + 了 + Number + Measure word + Object

• 我喝了三杯水。 Wǒ hē le sān bēi shuǐ. — I drank three glasses of water.
• 她买了两件衣服。 Tā mǎi le liǎng jiàn yīfu. — She bought two pieces of clothing.
• 我买了一点儿苹果。 Wǒ mǎi le yìdiǎnr píngguǒ. — I bought a few apples.

Only with action verbs

Completion 了 pairs with action verbs. Stative verbs (states, not events) — 是 shì (to be), 在 zài (to be at), 喜欢 xǐhuan (to like), 爱 ài (to love) — do not take 了₁ for “past.” Use a time word instead:

• ❌ 昨天是了星期一。 Zuótiān shì le xīngqīyī.
• ✅ 昨天是星期一。 Zuótiān shì xīngqīyī. — It was Monday yesterday.
• ❌ 昨天我在了家。 Zuótiān wǒ zài le jiā.
• ✅ 昨天我在家。 Zuótiān wǒ zài jiā. — I was at home yesterday.

了₂ — Change of state (“now it’s different”)

Sentence-final 了₂ is Mandarin’s built-in “get / become / turn.” You do not need a new verb for “it’s getting cold” — you add 了 at the end.

Subject + [what has changed] + 了

More everyday announcements:

• 天气热了。 Tiānqì rè le. — The weather has gotten hot.
• 外面下雨了。 Wàimian xià yǔ le. — It’s raining outside (now).
• 你女儿今年几岁了？ Nǐ nǚ’ér jīnnián jǐ suì le? — How old is your daughter now?
• 我走了！ Wǒ zǒu le! — I’m off!
• 我不喝咖啡了。 Wǒ bù hē kāfēi le. — I’ve stopped drinking coffee (change of habit).

Why 了 is not past tense

Completion can sit in the past or the future. 了₁ only says the first action is finished relative to the next one — the time word sets the calendar.

• 昨天下课以后我去和同学打篮球了。 Zuótiān xiàkè yǐhòu wǒ qù hé tóngxué dǎ lánqiú le. — Past event.
• 上个星期我看了一部特别有意思的电影。 Shàng gè xīngqī wǒ kàn le yī bù tèbié yǒuyìsi de diànyǐng. — Past event with quantified object.
• 明天到了上海我要先去见我的老师。 Míngtiān dào le Shànghǎi wǒ yào xiān qù jiàn wǒ de lǎoshī. — Future: “once I’ve arrived in Shanghai…”
• 今天下了班以后你打算做什么？ Jīntiān xià le bān yǐhòu nǐ dǎsuàn zuò shénme? — Later today, after finishing work.

Typical shape for “after Verb₁, Verb₂”: two verbs, 了 after the first. Habitual past (“I used to…”) usually takes no 了 — use time words instead.

• 我见了他以后才能决定要不要跟他的公司合作。 Wǒ jiàn le tā yǐhòu cái néng juédìng yào bu yào gēn tā de gōngsī hézuò. — Only after meeting him can I decide whether to cooperate with his company.

• 我改了以后发给你，你别担心。 Wǒ gǎi le yǐhòu fā gěi nǐ, nǐ bié dānxīn. — I’ll send it to you after I revise it. Don’t worry.

Double 了 — “so far, and still”

Top-ranking grammar guides highlight a pattern many blog posts skip: Verb + 了 + quantity/duration + 了. The first 了 marks progress so far; the final 了 says this is the current state (often implying continuity).

• 我吃了三碗饭了。 Wǒ chī le sān wǎn fàn le. — I’ve eaten three bowls (so far).
• 他学了三年中文了。 Tā xué le sān nián Zhōngwén le. — He’s been studying Chinese for three years (and still is).

Compare: without the final 了, a quantified completion often reads as a finished total, not a running total.

Negation, questions, and dialogue patterns

Negation — 没 replaces 了

To say an action did not happen, use 没 méi / 没有 méiyǒu and drop 了. They cancel each other: 没 = “not done,” 了 = “done.”

• ❌ 我没吃饭了。 Wǒ méi chī fàn le.
• ✅ 我没吃饭。 Wǒ méi chī fàn. — I didn’t eat.
• ✅ 她没买衣服。 Tā méi mǎi yīfu. — She didn’t buy clothes.

For the broader 不 bù vs 没 méi contrast, see the difference between 没 and 不.

Yes/no questions

Subject + Verb + Object + 了 + 吗 ma?

• 你吃饭了吗？ Nǐ chī fàn le ma? — Have you eaten?
• 你看电影了吗？ Nǐ kàn diànyǐng le ma? — Did you watch the movie?

Real conversation snapshots (Research Team)

Bonus: 不了 / 得了 (pronounced liǎo)

Same character, different reading. After a verb, 了 liǎo marks whether something is doable:

• Verb + 得了 de liǎo — can manage to…
• Verb + 不了 bu liǎo — cannot…
• 我受不了。 Wǒ shòu bu liǎo. — I can’t stand it.
• 你吃得了这么多吗？ Nǐ chī de liǎo zhème duō ma? — Can you eat this much?

This is not the particle le in the sections above — listen for the tone: liǎo.

了 vs 过 (guò)

Both relate to experience and completion, but they answer different questions.

Full contrast: Difference between 过 (guò) and 了 (le). Measure words with numbers often appear next to 了₁ — refresh them in Numbers in Chinese.

Common mistakes (with fixes)

1. Treating 了 as “-ed.” Fix: ask completion vs change, not “is it past?”
2. Keeping 了 with 没. Fix: 没 + verb, no 了.
3. Number + 了 at the end. Fix: Verb + 了 + number + measure + object.
4. 了₁ on stative verbs. Fix: time word + 是 / 在 / 喜欢 — no completion 了.
5. Omitting 了₂ on breaking news. Fix: 天冷了 Tiān lěng le, 我来了 Wǒ lái le.

Cultural note: 吃了吗？ (Chī le ma?)

GoEast Research Team note: 吃了吗？ Chī le ma? (“Have you eaten?”) is one of Mandarin’s classic greetings — often less about food than care. The courtesy of asking whether someone had eaten before entering a home appears in traditional neighborly codes such as the 《吕氏乡约》 Lǚshì Xiāngyuē associated with the Northern Song period; over time the phrase became everyday warmth, especially around mealtimes. A natural reply is simply 吃了 Chī le — “yep, I have.”

Frequently asked questions