已知甲数比乙数的2倍大1，如果设甲数为x，那么乙数可表示为______；如果设乙数为y，那么甲数可表示为______．

根据答语写出问句。

1. —_______________________ 

    —My birthday is July 8th.

2.  —_______________________

    —I'm fourteen. 

3. —_______________________

    —My sister's birthday is August 16th.

4. —_______________________ 

    —The party is December 24th.

5. —_______________________ 

   —My mother is thirty-nine.