Formal Interrogative Ending

To ask a question, you can use the ㅂ니까 ending with a question mark. The rules on how it all connects are the same as above.

학생이 도서관에 많습니까?: Are there a lot of students in the library?; (student library-in many?)
지금 무엇을 합니까?: What are you doing?; (now what do?)

Or you can insert the honorific marker (시).

Thanks to these friends: