write (to someone), send a letter
"我留下朋友的地址记得要来信"
I left you my friend’s address. Remember to write.
— 天堂电影院 (1988)
大嘴来信了
A letter from Big Mouth has arrived.
— 孤胆特工 (2010)
他来信了吗？
Has he written yet?
妳爸爸来信了没有？
Have you gotten a letter from your father yet?
— 色‧戒 (2007)