你到那兒后給我寫封信。

　　Drop me a line when you get there.

　　他偶爾給我寫封信。

　　He sometimes writes to me.

　　給我們寫封信，能收到你的信總是讓人很高興。

　　Drop us a line, it's always great to hear from you.

　　你可以給他打個電話或者給他寫封信。

　　You can call him or write to him.

　　我買了這雙鞋，這樣我就可以在星期天給媽媽寫封信了。

　　I bought this shoes, so I could print a bit of a letter to mother on Sunday.

　　那位老人要我替他寫封信。

　　The old man asked me to write a letter for him.