a story
one day i saw a boy falling off from a tree, when i was coming home from school.i felt so scared, so i call the ambulance quickly. then it came and sent the boy and i to the hospital soon.
when the boy was treated, i called his parents.(这里有点奇幻啊··怎么就知道他父母的电话捏~~)
his parents were very hurry. when they came, the boy was sleeping and was fine.
差不多70了吧 不够自己再添点
过去进行时,可以适当用些when引导的时间状语从句,表示某个时间点,谁正在干什么.