Translation of "Sending" in Chinese

I'm sending you a birthday present by airmail.

我寄給你一個航空郵件生日禮物。

Thank you for sending me a nice card.

谢谢你寄给我的一张漂亮的卡片。

A grandmother is sending her grandson to school.

有一位奶奶带着小孙子上学。

He's at the post office sending a package to a friend.

他在邮局给朋友寄包裹。