英语里面，给某人写信可以这样子表达：

靠前种，write to ***，比如说：i write to my parents every week,意思就是我每个星期写信给我的父母。

第二种，write a letter to ***,比如说：Tom writers a letter to his best friend to congratulate him on his success,意思是Tom写信给他最好的朋友，祝贺他取得成功。