How to form questions in Japanese

If you want to ask a question, you just add か （'ka') at the end of a statement.
For example, your statement is 'きって　です。' which means 'It is a stamp.', you can add 'ka' at the end of this statement to form a question. Hence, 'Is it a stamp?' can be rendered 'きって　です か 。'

If you say, 'Yes it is.', then the Japanese equivalent is 'はい きって　です。’ (Hai, kitte desu.)

On the other hand if your answer is in the negative, then you would say 'いいえ,きって ではありません.'Iie, kitte dewa arimasen' which means 'No, It is not a stamp.'