Hardly……when 的用法如Hardly had I left home when it began to rain.

Hardly……when 的用法如Hardly had I left home when it began to rain.
Hardly……when 的用法如Hardly had I left home when it began to rain.

Hardly……when 的用法如Hardly had I left home when it began to rain.
hardly... when.是固定结构,意思是“刚刚.,就.”
如果hardly在开头,主语要倒装.
你给出的句子意思是：
我刚刚离开家门,天就下雨了.