To buy rice to eat, then walk up the classroom in order to go to school again after a period of time, 16: 0, walked out of the classroom in order to go for a walk and work with some friends and travels back home by bus .
To buy food, then walk up to the classroom to study again at 16:00 when I walked out of the classroom for a walk and run with a friend for a while and went back home by bus.
To buy rice after then went up the classroom to study again when the time 16: 00 walked out of the classroom to go for a walk, and the work with a friend for a while, and returned home by buses .