了 for Completed Actions
完成态：了
Express completed actions with specific results
Place 了 directly after the verb to indicate the action has been completed, often followed by a specific quantity or object to show the result.
This is called 了¹ or "verb-了." It marks completion of an action and usually pairs with a quantified result: 买了两个 (bought two), 喝了一杯 (drank a cup).
Lesson Targets
Podcast
Podcast: 了 for Completed Actions (完成态：了)
Listen to Jason & Amy explain the 完成态：了 pattern
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Understanding 完成态：了
Completion 了 is your "done" stamp. Stick it right after a verb to say the action is finished and came with a concrete result. "He bought two loaves of bread" = 他买了两个面包. Notice the 了 snuggles up to the verb (买了), and a quantity follows (两个面包). This pattern loves specifics — it answers "what exactly did you do?" rather than just "what happened?" Here is an important mindset shift: 了 is NOT "past tense." English trains you to think in terms of past, present, and future, but Chinese thinks in terms of completion. An action can be completed in the future too: 你吃了饭再走 means "leave AFTER you've eaten" — future completion! Once you stop thinking "了 = past" and start thinking "了 = done," everything clicks.
Key Points
- V + 了 marks the verb as completed: 我吃了 (I ate / I've eaten)
- Usually followed by a quantity or specific object: 他喝了三杯茶 (He drank three cups of tea)
- Negative: 没(有) + V — drop the 了 entirely! 他没喝茶, NOT 他没喝了茶
- Questions: V + 了 + Object + 没有? or 有没有 + V + Object?
- Completion 了 is NOT past tense — it marks completion, which can even be in the future: 你吃了饭再走 (Leave after you've eaten)
- If V + 了 ends the sentence without a quantity, it often merges with change-of-state meaning: 他走了 (He left — he's gone now)
- In narration, chain completed actions: 我起了床，洗了脸，吃了早饭 (I got up, washed my face, ate breakfast)
- Duration after V + 了: 我等了两个小时 (I waited for two hours) — the 了 confirms the wait is finished
When a Chinese host asks 你吃了吗？(Have you eaten?), it's actually a casual greeting — like saying "How's it going?" The expected answer is often just 吃了吃了 (Yep, I've eaten), even if you haven't. It reflects a culture where food is a sign of caring.
Key Vocabulary
Example Sentences
他买了两个面包。
He bought two loaves of bread.
Verb + 了 + quantity + object
我喝了很多水。
I drank a lot of water.
她看了一个小时的电视。
She watched TV for an hour.
Completion with duration
我们学了二十个生词。
We learned twenty new words.
他没吃早饭。
He didn't eat breakfast.
Negative: 没 + V, no 了!
你买了几本书？
How many books did you buy?
我在网上订了两张票。
I booked two tickets online.
Shopping scenario with specific quantity
医生给我开了一些药。
The doctor prescribed me some medicine.
At the doctor's office
昨天我们在饭馆吃了一顿大餐。
Yesterday we had a big meal at a restaurant.
Restaurant scenario with 一顿 (a meal)
我给妈妈打了一个电话。
I gave Mom a call.
Completed phone call
Common Mistakes
When you negate with 没, you MUST drop 了. The 没 already implies the action didn't complete, so 了 is redundant.
Using V + 了 in every short sentence sounds robotic. In connected narration, chain the clauses naturally and use sentence-final 了 at the end to close the sequence.
Completion 了 goes AFTER the verb, not before it. The order is always V + 了.
Practice Exercises
Tips & Tricks
Remember: 了 is NOT "past tense." It marks completion, which can happen in the future too: 你做了作业再玩 (Play after you've finished homework).
If your sentence with V + 了 feels incomplete, add a quantity! 我吃了 sounds hanging, but 我吃了两碗 sounds complete.
Quick rule: 没 kills 了. Whenever you see 没, delete 了 from your sentence. They are mortal enemies.
Quantity is your completion buddy. If a V + 了 sentence feels incomplete, add a number: 我看了 (hanging) → 我看了三页 (I read three pages — complete!).
Practice narrating your day like a story chain: 我起了床，刷了牙，吃了早饭，然后出门了。This builds fluency fast.
Homework
Write about what you did yesterday. Include at least six completed actions with specific quantities: how many things you ate, how many pages you read, how long you studied, etc. Then rewrite three of them in the negative form using 没.