Yes, 2 is incorrect. You could rephrase in any of these ways, depending on what you mean:
Do you know how many islands ... ?
Do you wonder how many islands ... ?
Do you think Dokdo is made up of more than ten islands?
There may be others, but these come to mind first!
1. How many islands do you think Dokdo is made up of?
2. Do you think how many islands Dokdo is made up of?
(Is #2 incorrect? Why is that?)
1 answer