1、如果是“收到来信”的话,不能分开.
heard any letters from her不对.any letters 多余,因为hear from 本身已是收信的意思了.
We hear from Wuhan often.
我们时常接到从武汉来的信.
He looked to hear from her.
他期望收到她的信.
Hoping to hear from you soon.
望早日得到你方消息.
2、分开用也可以,不过意思不同：
Hear the music from below.
听到从下面传来的音乐声.
From two blocks over he could hear the thin wail.
他从两条街以外的地方就能听到那微弱的哭泣声.