第一对she问:
Who does often go to see Beijing Opera with your father?
第二对her father提问:
Whom does she often go to see Beijing Opera with?
或者：With whom does she often go to see Beijing Opera?
对于被提问的词在句子中作主语,疑问词只能是who,但是如果是宾语,who/whom都可以,不过是介宾结构,疑问词只能是whom,这道题就是这样.
还有,在由陈述句改为疑问句时,相应的物主代词也要变化,如第一句中的her就要改为your.
我觉得到现在为止,很多人提供的答案,口语说说还可以,用于卷面上,还是不过关的
补充问题的答案是：My favorite sport is tennis.这里sport应该是单数,因为主句谓语是is.