we don't know when ______ (start)

we don't know when ______ (start) l don't know when we will start this afternoon I don’t know when we shall start the work. 句型转换I don't know when we will start.l _____ _____ ____ when we don't know when we'll start.(改为简单句) We don`t know when we shall start .(改为to do 的结构） We don`t kn I don't know when we shall start.(改为简单句) I don't know ____ _ I don't know when we would start.中would 为什么不能用will I really don't know when I will start my trip=I really don't We don't know when we shall leave for Nanjing. 同义句I don't know when I can start the new lesson=I don't know we don't know when we will have the school trip = we don't k