给某人写信用英语怎么说2个

"Write a letter to someone" 可以说为 "compose a letter to someone"。
例句：I'm going to compose a letter to my pen pal in England.
翻译：我要给我在英国的笔友写封信。
"Write a letter to someone" 可以说为 "draft a letter to someone"。
例句：I'm going to draft a letter to my parents, updating them on my life.
翻译：我要给我的父母写封信，更新他们我的生活情况。
来源：这两个表达方式均来自于英语的日常用语。