we are panning to have a surprise party herwe are panning to have a surprise party her fifteenth birthday?用什么时间介词,为什么

问题描述:

we are panning to have a surprise party her
we are panning to have a surprise party her fifteenth birthday?
用什么时间介词,为什么

for
"为." 表目的
我们正在筹划为他的15岁生日举行一次惊喜聚会.