when is Tony 's birthday party 的主语?

when is Tony 's birthday party 的主语? 英语翻译翻译：A birthday party Today is Jane's birthday.Jack,Tony a when' s your birthday party? —happy birthday,sally.when is ( ) birthday party?—It's at 6: when will jim\'s birthday party start When is petet's birthday 的意思 英语问答题When is your birthday party? When is Tom's birthday party going to be/have it is better ( When is Sally and Lucy's birthday party? They're May 1st Do When is Henry's birthday party,Lynn The 18th,___about three When is Peter' s birthday? When is Yaoming's birthday?