"where is the post office?" a visistor asked lan > a visistor asked lan____________________

A visitor asked Lan where the post office is. In this sentence, the visitor is seeking information about the location of the post office, and Lan is the person being asked.

To reformulate this in a complete structure, you could say: "A visitor asked Lan where the post office is." This implies that the visitor does not know the location and is looking for directions or guidance from Lan.

In Vietnamese, this can be expressed as: "Một du khách đã hỏi Lan bưu điện ở đâu." Here, "du khách" means "visitor," "hỏi" means "asked," and "bưu điện" means "post office." This structure captures the essence of the original question, making it clear that the visitor is inquiring about the location of the postal service.