where are you 为什么不加in?平时说我在北京 I am in BeiJing,变成问句时为什么不加in了,还有at 北京和in 北京用法上有什么区别?at 北京和in 用法上有什么区别

where引导的疑问句解惑为什么where are you from?要加介词from,where have you gone?不加介词to,变成where have you gone to? Who are they talking to?to什么时候加?为什么加?Where do you live?为什么不加in?什么时候加? i am very older than you are .为什么这里还要加are?不加可以吗 where are you from 为什么不能用 where from are you 1.i want to go swimming 2.where do you swim 为什么一个加ing一个不加ing where you are,where i am where是地点副词所以不能加介词,那where are you from是怎么回事?还有where to do it要加it,what to do 为什么不加it where是地点副词所以不能加介词,那where are you from是怎么回事?还有where to do it要加it,what to do 为什么不加it Where are you heading for?介词加副词?where 不是副词吗？为什么不是what? Where the more different you are,the better.是什么句式?前面为什么加个where? I am younger than you are 为什么加个are? I am younger than you are 为什么加个are? 1.where are my books为什么where后面要加are?2.are 什么时候被翻译什么时候不被翻译 I promise you 为什么不加to Where are you?I think you!Take I need you now,where are you Where are you from?为什么用“are”? how I wish we studied___there are fewer exams!you are jokingA where B in which C the place where D in where 为什么选A不选C,A与B不是一样的吗?