Where is the library? (Do you know)
Do you know where the library is?
Is the post office open today? (I don't know)
I don't know if the post office is open today.
What should I read? (Tell me)
Tell me what I should read.
Why don't you like this book? (I don't understand)
I don't understand why you don't like this book.
Who is the professor? (Could you tell me)
Could you tell me who the professor is?
Did I return my books to the library? (Do you remember)
Do you remember if I returned the books to the library?
Whose books are these? (I forgot)
I forgot whose books these are.
Do you need my help? (I'd like to know)
I'd like to know if you need my help.
Where is the bookstore? (Can you show me)
Can you show me where the bookstre is?
