按要求修改以下句子：
问题描述：
按要求修改以下句子：
It´s twelve o´clock.(用what time提问)
Kim is playing table tennis.(用what提问)
I can see Billy.(用not改成否定句)
Bob and Pam are playing football.(用they代替Bob and Pam)
答
what time is it?
what is Kim playing?
i can not see Billy.
they are playing football.