In a formal setting like a job interview, and when you talk with someone formally we have to use 입니다, 입니까?
In a statement, you can use ‘입니다‘
In a question sentence, you can use ‘입니까?’
In a negative sentence, you can use ‘이/가아닙니다.’
입니다 means to be.입니까 is an interrogative form & used to make questions.입니다 입니까 are used after a noun and are used in formal conditions like in Newspaper/ TV News.
|Informal situation||Formal situation|
|N이/가 아니에요||N이가 아닙니다|