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11. Mr and Mrs Smith are flying to Ha Noi now. TRAVELLING
=> Mr and Mrs Smith are travelling to Ha Noi now
12. Van had a motorbike once, but he doesn’t have any more. USED
=> Van used to have a motorbike once
13. My father usually goes to work by car. DRIVES
=> My father usually drives to work
14. This part of the city didn’t have traffic jams very often. USE
=> This part of the city didn’t use have traffic jams
15. I used to walk to school when I was young. FOOT
=> I used to go to school on foot when I was young