how long做疑问词时 问句后什么时候要加for 什么时候不用加比如说I have lived here for ten years.对for ten years进行提问How long have you lived here?和How long have you lived here for?有什么区别么另一例句 How long do you want it for?答语是For three weeks.可以改成how long do you want it?么
问题描述：
how long做疑问词时 问句后什么时候要加for 什么时候不用加
比如说I have lived here for ten years.对for ten years进行提问
How long have you lived here?和How long have you lived here for?有什么区别么
另一例句 How long do you want it for?答语是For three weeks.可以改成how long do you want it?么
答