when is your birthday为什么用are提问

when is your birthday为什么用are提问 when is your birthday?how are you? When is your birthday? Are you happy when your birthday is coming? when ＿＿ （is,are ）your birthday when is your birthday回答 WHEN IS YOUR BIRTHDAY?(回答) When is your u__ birthday? When is your birthday on? When is your birthday?英文翻译 用英语询问生日是 When is your birthday?还是 When was your birthday?是不是 when is your birthday?Where are you from?请问在问句的your之前,什么时候用i