33.Lynn:Mum,let's go on a trip this Saturday,OK? Mum:No.Your grandmother will come to our house. Lynn:That's great!May we go to the airport? Mum:Sure.We will take a bus to the airport. Lynn:May we take a car?A car is fast. Mum:But I can't drive a car. Lynn:We can get my dad to drive. Mum:OK! Lynn:When will my grandmother arrive? Mum:She will arrive at 2:00 in the morning on May the first. 1.Why can't they go on a trip this Saturday?