hardly/scarcely…when/before, no sooner…than　和as soon as都可以表示"一…就…"的意思，例：

　　I had hardly / scarcely got home when it began to rain.

　　I had no sooner got home than it began to rain.

　　As soon as I got home, it began to rain.

　　注意：

      如果hardly, scarcely 或no sooner置于句首，句子必须用倒装结构：

　　Hardly / Scarcely had I got home when it began to rain.

　　No sooner had I got home than it began to rain.