回信
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。
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