when i was waling on the road,i happend to /happening to see him yesterday

when i was waling on the road,i happend to /happening to see him yesterday I am strong when I was on your shoulders I was in Beijing on the day when he arrived. when I was young? When i was thriteen It happened when I was walking on the road this morning.中when的用法 I thought that it mattered,was when and where I said,then I realized ,the on ____ I was falling asleep,there was a loud knock on the door.(when/while) it was raining hard___ i was on my way home yesterday空里应填when还是while 为什么? when i entered the room,i was surprise to see anake on my bed.改错 43.I saw the accident _________ when I was walking on the road this morning . When I was on the track team,I used to run the quarter mile I was a teacher when I was when I was a young boy,I often play jokes on others.这句话里的when 能换成as i was ___ seventy when i was on the highway.A.going B.doing C.speeding D.starting I lived on the Happy Farm when I was a child.（对on the Happy Farm提问）快 1）i dropped the baton on the groud when i was——it on to Tim last year ,when i was on my asia trip怎么翻译