01 who do you come with?               dare to kimasuka?
02 who do you want to see?             dare ni aitai desuka?
03 whom do you want to see? (polite)   donata ni oai ni naritai desuka?

04 who are you looking for?            dare wo sagashite imasuka?
05 whom are you looking for?(polite)   donata wo sagashite irassyai-masuka?

06 why?                                naze desuka?
07 why?                                dooshite desuka?
08 why not?                            doushite dame desuka?

09 why do you say such a thing?        naze son-nakoto wo iuno desuka?
10 why did you do such a thing?        dooshite son-nakoto wo shitano desuka?

*suru=do
*shita=did