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Ai đó đang chờ bạn ở cửa.
That person is waiting for you at the door.
A person who is not specified or known to the speaker or listener.
Tôi không biết ai đó là ai.
I don't know who that person is.
Ai đó đã để lại một bức thư cho bạn.
Someone left a letter for you.
Used to refer to an unspecified person, often in a neutral or informal context.
Use 'ai đó' when referring to an unspecified person in a casual or informal setting.
Derived from 'ai' (who) and 'đó' (that), combining to refer to an unspecified person.
Commonly used in everyday conversation to refer to someone without specifying their identity.