sir

Thưa ngài, thưa ông

a formal way of speaking to or about a man, especially one who is in charge or has an important job

• address sb as sir

Collocations sir, may I ask a question? · the gentleman was addressed as sir

• The waiter asked him if he would like some coffee, sir.

  Bồi bàn hỏi ông có muốn uống cà phê không ạ.

Thưa ngài (trong quân đội)

a formal way of speaking to or about a man in the army, navy, or air force who has an important job

• address sb as sir

Collocations sir, yes sir! · the general was addressed as sir

• The soldier saluted and said 'Yes, sir!'

  Tên lính chào và nói 'Dạ thưa ngài!'.

Thưa ông (trong dịch vụ)

a polite way of speaking to a customer, especially in shops or restaurants

• address sb as sir

Collocations sir, how can I help you? · the customer was addressed as sir

• The shop assistant greeted him with 'Sir, how may I assist you today?'

  Nhân viên bán hàng chào ông và hỏi 'Thưa ông, tôi có thể giúp gì cho ông hôm nay không ạ?'.

Thưa giáo sư (trong giáo dục)

a formal way of speaking to or about a male teacher or professor in some educational settings, especially in the UK and US universities

• address sb as sir

Collocations sir, may I ask a question? · the professor was addressed as sir

• The student respectfully asked the professor 'Sir, could you explain this concept further?'

  Học sinh lịch sự hỏi giáo sư 'Thưa giáo sư, có thể giải thích rõ hơn về khái niệm này không ạ?'.