The word why is sometimes used as a mild interjection at the beginning of a sentence. It's basically like saying "As a matter of fact he was, Robin." There are a seemingly infinite number of equivalent expressions that serve the same purpose."Is it true that Sir Guy of Coventry was your unkle?", asked Robin.
"Why, yes, Robin", answered his mother.
1. What the "Why" is there for? (The same is repeating through the book)
Why, you could indeed--especially if you want to be grammatically correct. I finished to read "Robin Hood" is wrong. You don't finish to do st, you finish doing st. Follow it with a gerund, not an infinitive.I finished to read "Robin Hood"...
2. Could I say - I finished reading "Robin Hood"...
Why, I believe we're done here.
Hope this helps.
Student or Learner