Meaning of the verb "read" in various tenses

Question

1. Have you already read the book? Yes, I have already read the book.

Does it mean that the person have read the entire/whole book to the end? Or it is not necessary and generally depends on context?

2. Did you read the book? Yes, I did.

As far as I guess it usually means "read entire the book" whereas "I read a part of the book" usually can be expressed by the past continouse tense: "I was reading the book". Am I right?

3. Haven't you read the book, yet? Yes, I haven't read the book.

In contrast to the first sentence, which implies the two meanings, the last sentence defintely means that I even didn't "open" the book. Because if I read a part of the book then I have read a book of course.

Answer 1

First of all, let's confirm that "the book" would normally imply the whole book.

If someone asks "did you read the book?", the most likely answers are:

• Yes, I read it (completed it)
• No, I didn't read it (not touched it)
• I am reading it (starting, but not completed)

When asking "haven't" you done something, rather than asking "have" you done it, there is certainly a different inference in the question:

• Have you read the book? (an open question, no assumption)
• Haven't you read the book? (a question that assumes you haven't and seeks to confirm that assumption)

However, the potential answers should be no different:

Q. Haven't you read the book?
A. Yes I have / No I haven't / I'm still reading it.

Answer 2

1 and 2: If you say "I have read the book.", it means you have read the entire book. If you have read only part of the book, you would say "some of the book", or "part of the book".

3. The answer "Yes, I haven't read the book." is not idiomatic. "Haven't you read the book yet?" would be answered by either
   3a "Yes, I have read the book." or
   3b "No, I haven't read the book."

The negative answer (3b) means that I didn't read the whole book. It doesn't mean that you didn't open it or read part of it.