那是谁用英语怎么说

"Who is that?" is how you ask someone in English to identify a person or an object. This question is commonly used in daily conversations to seek clarification about someone's identity. It is important to use this question politely and respectfully as it may cause offense if asked abruptly or without proper context. By asking "Who is that?", you are showing interest in the person or object being discussed and seeking more information.