How would you react to this question?
Can I do you a favor?
A wonderful example of a grammatically correct but idiomatically strange question. At least, that's what I thought.
Running a check on Google Fight came up with this result:
Added to that, a normal ]Google search came up with 677,000,000 results for Can I do you a favor? and 247,000,000 hits for Can you do me favor?
I guess my student was unconsciously right. The question, which may sound in the classroom, is perfectly acceptable in real life.
So, can I do you a favor?