か

It is used to express uncertainty, doubt of the speaker. A question is formed by adding 「か」 at the end of the sentence. In this type of question, the 「か」 at the end of the sentence is pronounced with a rising intonation. This type of question confirms whether a statement is true or false. If it is true, the answer is 「はい」(yes), if it is not true, the answer is 「いいえ」(no).