when to start?

when to start? When did Lu Xun start to write do know start you to when when are we going to start? when did you start to learn english? 填空:When a_______ you going to start. Nobody()(know)when to start the work. When are you going to start?I'm going to start when l finish Can you tell me when to start our lessom?这里的when to start ou When do you start to work?为什么要加to? I'll call wendy to make sure when to start. 疑问词加不定式the question is when to start中when是to start的逻辑宾语,那么to