send a letter（）you.（）中填to还是for还是其他的?请举几个例子

send sth to sb 所以是to

to
send sth.to sb.
or
send sb.sth.

to
send for a doctor send for 是固定短语，意思是派人去请
eg,Mike have a headache,please send for a doctor.
send sth to sb 意思是送某物给某人
eg.Please send my love to your mom.

to
send to 发送到；发送给
例句
I have two suits to send to laundry.
我有两套西装要送干洗店去洗。

to you 给你的意思
for you 是为了你的意思

to
例句：
Will you send a letter to me after you go back to England?
你会英国之后会给我写信吗？
I will send a letter to you if I'm free.
我有空的时候会给你写信的。

send sth to sb是固定搭配。