これ
In 「これは何ですか?」, これ means “this,” referring to an item being indicated near the speaker. It is used when asking about or identifying the item being pointed to. A beginner can use it when asking what an item is.
は
In 「これは何ですか?」 and 「それは何ですか?」, は marks the topic, showing what the question is about. It follows the item or person being discussed. This pattern is useful for asking about or describing a particular thing.
何
In 「これは何ですか?」, 何 means “what” and asks for the identity of the indicated item. It appears before ですか in this polite identification question. Use it when you do not know what an item is.
です
In this dialogue, です gives the statement a polite form in questions such as 「これは何ですか?」 and 「あの人は誰ですか?」. It connects the topic with the information being requested. This is useful in polite beginner questions about identity.
か
At the end of 「これは何ですか?」, か marks the sentence as a question. It follows the polite form です to create a polite question. Use it at the end of a similar polite question.
それ
In 「それは何ですか?」 and 「それはあなたのです。」, それ means “that,” referring to an indicated item. It can be used as the topic when asking about the item or stating who it belongs to. A learner can use it when referring to a particular item that is not called これ.
あの
In 「あの人は誰ですか?」, あの means “that” and points to a person over there when combined with 人. Together, あの人 identifies the person being asked about. Use this expression when asking about the identity of a person at a distance.
人
In 「あの人は誰ですか?」, 人 means “person.” It combines with あの to form あの人, meaning “that person.” This noun is useful when referring to a person whose identity is being discussed.
誰
In 「あの人は誰ですか?」, 誰 means “who” and asks for the identity of a person. It appears before ですか in this polite question. Use it when you want to ask who a particular person is.
どれ
In 「どれがあなたのですか?」, どれ means “which one” and asks the listener to choose one item from several possibilities. It is the item identified as belonging to the listener. Use it when asking which item is the relevant one.
が
In 「どれがあなたのですか?」, が marks どれ as the item being identified as yours. It follows the choice word in this question. This pattern is useful when asking which option or item has a particular property.
あなた
In 「どれがあなたのですか?」, あなた refers to the person being addressed. With の, it identifies that person as the owner: あなたの means “yours” here. Use it when asking which item belongs to the person you are speaking to.
の
In 「あなたの」 and 「私の」, の shows who an item belongs to, giving the meanings “yours” and “mine” in this dialogue. It follows the person or owner reference. Use this form to identify ownership of an item.
私
In 「これは私のです。」, 私 refers to the speaker as the owner of the item. Together with の, 私の means “mine” here. Use it when identifying an item as belonging to yourself.