I don't konw when we _____ start

句型转换I don't know when we will start.l _____ _____ ____ when ----When _____ the meeting _____?------I don't konw yet. I don’t know when we shall start the work. we don't know when ______ (start) I don't konw I don‘t konw I don't konw . I don't know when we shall start.(改为简单句) I don't know ____ _ i don"t konw which sweater _____(choose) I don't know when we would start.中would 为什么不能用will ：We don’t konw Jack______Bruce. l don't know when we will start this afternoon