回了封信用英语怎么说

回了封信通常可以用 "reply" 或 "respond" 来表示，意思是回复、做出反应或回应。这两个动词都来自拉丁文 "respondere"，意思是回答、做出反应或回应。
下面是一些例句：
I replied to his email yesterday. (我昨天回了他的电子邮件。)
She responded to my message right away. (她立刻回复了我的信息。)
I will respond to your letter as soon as I receive it. (我一收到你的信就会回复。)
He replied to my invitation and said he would come. (他回复了我的邀请，说他会来。)
你也可以使用其他动词来表示回信，如 "answer" 或 "write back"，意思分别是回答、写回。
例如：
I will answer your letter as soon as I can. (我会尽快回复你的信。)
He wrote back to me and said he would be happy to help. (他写回给我，说他很乐意帮忙。)