Grammar

I want to know why you chose to become a writer.

I am interested to know where your ideas come from.

How long did it take to write your first book?
I want to ask you how long it took to write your first book.

I wonder if any of the characters in the Harry Potter book are based on real people.
(or ..... if any of the characters in Harry Potter are based on ...)

2007-07-18 13:32:31 補充：
最後一句問題是close end question, 即「是否....」 故 wonder 之後要加 if. 若不是 close end便不用了. 例如:I wonder how you develop so many interesting ideas.