Learn Hardcore Chinese: tā kànwán nà běn shū le ma?

完 (wán) is a resultative complement: 看完 means “to finish reading.”
The 了 here is the sentence-final particle (SFP) marking a new situation/result being queried; 吗 turns it into a yes–no question.
Together, 看完 … 了吗？ asks whether the result “finished” now holds. It’s not redundant: 完 states the result; sentence-final 了 targets the current status of that result.

Can I drop 了 or 吗? What changes?

Where can 了 go in this sentence? Is 他看完了那本书吗？ also correct?

Two common question patterns:
- 他看完那本书了吗？ (sentence-final 了
  - 吗)
- 他看完了那本书吗？ (aspectual 了 after the verb-complement)
Both are natural; any difference is minimal. Avoid using both kinds of 了 at once (e.g., 看完了那本书了吗？) in this simple question.

How do I answer this naturally, both yes and no?

Why do we need 本 between 那 and 书? Can I say 那书 or 那个书?

With demonstratives (这/那), Chinese requires a classifier: 这/那 + classifier + noun.
For books, the default classifier is 本: 那本书.
那书 is generally considered nonstandard, and 那个书 is wrong in standard Mandarin. Stick with 那本书.

What’s the difference between 看完 and 看过 in questions like this?

看完 emphasizes completion of the whole book: 他看完那本书了吗？ = “Has he finished that book?”
看过 marks experiential “have ever read (at least once)”: 他看过那本书吗？ = “Has he (ever) read that book?” It doesn’t say he finished it.

Do I need 完 to ask if he read it? What’s the difference with 他看了那本书吗？

他看了那本书吗？ asks whether the reading happened (an occurrence), not whether he finished.
他看完那本书了吗？ asks specifically about completion. For a long work (a book), use 看完 when you care about finishing.

Can I form the question without 吗, using the A‑not‑A pattern?

Yes. Common options:

Can I replace 那 with 这?

Yes. 这本书 means “this book.” Example: 他看完这本书了吗？

Pronunciation tips: is 那 pronounced nèi here? What about 了 and 吗?

那 is often pronounced nèi before a classifier in colloquial speech: nèi běn shū; nà is also acceptable.
了 and 吗 are both neutral tone here: le, ma.
看完 is kànwán (two falling tones in sequence; the first often sounds a bit lighter).

Can I use 把 here?

Yes: 他把那本书看完了吗？

把 highlights the affected object (那本书) and the result on it (finished). Meaning is very close; the 把 version can feel slightly more object‑focused.

Can I omit the object if it’s clear from context?

Yes: 他看完了吗？ is fine if “what” is obvious from context. Answers remain the same (看完了 / 还没).

What’s the difference between sentence-final 了 and aspect 了 in this context?

Aspect 了 (after the verb phrase) marks a completed event: 看完了那本书.
Sentence‑final 了 marks a new situation or change of state at the discourse level: 看完那本书了.
In questions, you can use either pattern before 吗; both are common.

Why is the classifier 本 used for 书? Are there alternatives?

本 is the default classifier for books and book‑like bound volumes.
Others (e.g., 册) exist but are formal or context‑specific. For everyday speech, use 本.

Is there any issue with using 已经 here?

他已经看完那本书了吗？ is natural and asks “Has he already finished that book?”
Affirmative answer: 他已经看完了。
If you strongly expect completion, you might also hear 他已经看完那本书了吧？ (tag‑like expectation), but that’s a different nuance.

How would I include a time phrase?

Do 他 and 她 sound the same?

Yes. 他 (he) and 她 (she) are both pronounced tā. In writing they differ; in speech you rely on context. 它 (it) is also tā.