15,when did John go to Vietnam?
16,What is your mother doing in the kitchen at the moment?
17,does she like playing table tennis?
18,how is the weather in the summer?
19,What is your father's weight?
20,không có phần gạch chân
21,how long is the ruler?
 

15.Who did John go to Viet Nam?
16.What is your mother doing in the kitchen at the moment?
17.Does she like playing tennis?
18.What is the weather like in the summer?
19.What is the weight of your father?
20.Where will they stay?
21.What is the length of the ruler?