［狀語從句］表示"一…就…"的結構

　　hardly/scarcelywhen/before， no soonerthan　和as soon as都可以表示一就的意思。例如：

　　I had hardly / scarcely got home when it began to rain. 剛回家，就下起雨來了。

　　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，句子必須用倒裝結構。例如：

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

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