as soon as, the instant that, the moment that, upon, at

as soon as 一…就(carnival 嘉年華
no sooner had … than 一…就…(特別用於過去式
the moment 在…的片刻
the instant 在…的即刻( instant 立即的

at

at the thought of 一想到( shudder 恐懼顫抖
at the sight of 一看到
at the first opportunity 一有機會
upon sth/ving 一…就