回信

issue a letter───发一封信

deliver a letter───下书

open a letter───拆信

sea letter───海信

send a letter───寄信

sign a letter───签一封信

write a letter───写信

answer a question───回答一个问题

answer allegations───回答指控

I sent her a message in answer to her last letter.───我给她捎了个信儿，回复她最近的来信。

answer to my request, he wrote a letter to George.───应我的请求，他给乔治写了封信。

I have a letter to answer.───我有一封信要回复。

I got to answer a letter that was written 50 years ago.───我给一封50年前的信回信

Any man that can write may answer a letter.───只要会写几个字，谁都会写一封复信。