Question

3．我爸爸正在房间里给叔叔写信．
My father is writing to my unclein the room now．

Answer 1

分析 My father is writing to my uncle．

解答 答案：My father is writing to my uncle．表达的是正在进行的事情用现在进行时be+doing，主语my father三单，故is，写信给某人write to sb，故答案是My father is writing to my uncle．

点评 write to是写给某某人的意思，
例：Please remind me to write to my mother tomorrow．
请提醒我明天给我母亲写信．
write for 是为某某人或事而写
例：He does not just write for fun； write is his bread and butter．
他写作并不只是为了乐趣，那是他的谋生方式．