下面什么句子是对的？或是两个都对？
Where do you drive?
Where do you drive to?
这二个句子改为过去进行时更能说明问题。
Where were you driving? I was driving in Beijing-Kunming highway.
where为地址状语。
Where were you driving to? I was driving to my office.
to where为目的地状语。
因此，二种结构都是正确的，意义有所不同。一个是drive的地址状语，一个是目的地或方向状语。