When you sing ,you begin with Do ,Re,Mi.When you stady ,you

When you sing ,you begin with Do ,Re,Mi.When you stady ,you When you sing,you begin with Do,Re,Mi.When you study,you beg Do you know when conputers begin?是什么意思 How do you know when computers begin? Do you know when computers begin? when do you begin ___（sing） for the foreign guests? when you re gone when you're gone When you hear birds singing, do you want to sing with them? 请问when do you begin to study English.和 when did you begin to What should you do when you're tired?（急!） do you know when _____ (begin) our work?