か is the particle used to make a polite question. It is placed at the end of a sentence. In polite Japanese, you usually need か to show that you are asking a question. Key points: • Add か to the end of a sentence to ask a question • Used with です/ます in polite speech • Question words (何, どこ, だれ) stay in place • Intonation is less important when か is present For example, “これは本ですか” means “Is this a book?” You take a normal sentence and add か. Another example: “どこへ行きますか” means “Where are you going?” In casual speech, people can ask questions without か by raising intonation, but for beginners, it is safest to use か. It makes your question clear and polite. You can also use か to offer choices: “コーヒーかお茶” means “coffee or tea.” This is a later nuance, but it is useful to recognize. For now, focus on the basic pattern: Statement + か. This simple step turns a statement into a polite question.