问题补充：
he was writing while suddenly the phone rang 哪里错了?
答案：
He was writing when suddenly the phone rang.
在这句话中,when=at that time
句意：他正在写东西,这时电话铃突然响了.
while没有这个用法.
它表示“当.的时候”,强调两个动作同时进行.
======以下答案可供参考======
供参考答案1:
While he was writing the phone rang suddenly .
供参考答案2:
was writing？
