1. Mr Thanh/ didn't/ to/ travel/ Korea.
--> Mr Thanh didn’t use to travel to Korea.
2. It/ 250 km/ Ho Chi Minh City/ Da Nang.
--> It is 250km from Ho Chi Minh City to Da Nang.
3. My hometown/ used to/ small village.
--> My hometown used to be a small village.
4. How/ it/ Ha Noi/ Singapore/ past?
--> How was it from Ha Noi to Singapore in the past?
5. Lana/ use to/ on foot/ school/ or/ car?
--> Did Lana use to be on foot to school or by car?
6. He/ used/ good/ student/ but/ now/ poor.
--> He used to be a good student, but now he is poor.