带信

例句：

1. 1. I need to write a letter to my friend.
   我需要给我的朋友写一封信。
2. 2. The postman delivered the mail today.
   邮递员今天送来了邮件。
3. 3. He sent a message to his sister before leaving for the trip.
   他在出发旅行前给姐姐发了一条消息。