1. When’s your birthday?
->What is your date of birth?
3.What’s his date of birth?
->When’s his birthday?
2.What is Lan’s date of birth?
->When is Lan's birthday ?
4.The party will start at three o’clock and finish at nine in the evening.
->The party will last 6 hours.
5.Our lessons usually start at seven and finish at eleven thirty in the morning.
->Our lessons usually last 4,5 hours
what có nghĩa là “cái gì”, thường được dùng để hỏi tên, đồ vật, nghề nghiệp, … Câu hỏi với what
cấu trúc là: What + be/trợ từ + S ?