hardly/scarcelywhen/before, no soonerthan　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.