1.When did you decide to be a teacher?2.Let me see.I'm thirty,and I have wanted to be one since I was twenty.请问这两句怎么翻译?第二句我感觉很乱,还有 第二句为什么有to be one?

1.When did you finsh_(pack)? When did you leave? When did you coneback? when did you come back? when did you have it when did you go last when did you sleep last when did you go last When did you go to When did you [ ] a meeting? when did you () here yesterday? When did you come to When did you have dinner When did you start out? When did you come to when did you go there? ----When did you ______ breakfast? when did you start to______?