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Verb + 了 + Duration + 了 (have been …-ing)
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Still waiting
- Your friend phones to ask where you are. You are still in the café where you have been since two o'clock.
- I我wait等(completed / change)了you你两个hour小时(completed / change)了！ — "I've been waiting for you for two hours (and I'm still here)!"
Verb + (completed / change)了 + Duration + (completed / change)了
- The final (completed / change)了 says the period lasts up to now and may continue: I我study学(completed / change)了three years三年Chinese中文(completed / change)了 — "I've been studying Chinese for three years."
- Without it, the period is over: I我study学(completed / change)了three years三年Chinese中文 — "I studied Chinese for three years."
I我study学了three years三年Chinese中文了。
You still live here: “I've lived here for five years.” 我在这儿住了五年____。
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The final 了 shows it continues up to now.
How long so far
- he他at在here这儿work工作(completed / change)了ten years十年(completed / change)了。 — "He has worked here for ten years (and still does)."
- Asking: you你study学to hit (the mark)中literature文学(completed / change)了多长时间(completed / change)了？ — "How long have you been learning Chinese?"
he他at在here这儿work工作了ten years十年了。
Build: “I've already been waiting for an hour.”
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已经 + verb + 了 + duration + 了.
One (completed / change)了 or two
- Two (completed / change)了 = still going: to live住(completed / change)了两年(completed / change)了 (I still live here). One (completed / change)了 = finished: to live住(completed / change)了两年 (I moved away).
- The duration still goes after the verb: study学(completed / change)了three years三年(completed / change)了, not three years三年study学(completed / change)了(completed / change)了.
Which sentence means the person still works at the bank?
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Two 了 = still going.
我学了三年中文 and 我学了三年中文了 mean exactly the same.
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The first is a finished period; the second continues up to now.
With already已经
- already已经 often comes in front to stress the length: I我already已经wait等(completed / change)了one一个hour小时(completed / change)了。 — "I've already been waiting an hour."
- The meaning of the two (completed / change)了 does not change; already已经 just adds emphasis.
I我already已经wait等了one一个hour小时了。
Recap
- Verb + (completed / change)了 + duration + (completed / change)了 = have been doing it for that long, up to now.
- One (completed / change)了 = a finished period; two (completed / change)了 = still going. already已经 adds emphasis.
Read the full reference: HSK 3 grammar — Verb phrases.
Your friend phones to ask where you are. You are still in the café where you have been since two o'clock. Close the examples. Say a Mandarin response, then write it in Chinese. Explain briefly in English what the lesson’s pattern adds. Compare with the model, then change one detail and try again.
This is supported productive practice. Compare meaning and structure; your answer need not copy the model. A partner or teacher must hear the spoken response to comment on pronunciation.