as soon as 这个词组在句子中的位置相当于立即、立刻或一…就,它可以连接一个时间状语从句,相当于"the minute/moment/second + 主句"或"no sooner than/hardly when",其中否定词需放在句首进行部分倒装。例如,"No sooner had I arrived home than I did my homework"。
as soon as 的用法主要体现在描述两种情况:一是描述未发生的动作,其结构为主句用一般将来时,从句用一般现在时。比如:"I will tell him the news as soon as he comes back." 如果想强调刚刚完成某事就如何,可以改用现在完成时:"I will go with you as soon as I have washed my face."
二是描述紧接着发生的两个动作,不论主句还是从句都采用一般过去时,如"He took out his English books as soon as he sat down." 有时,即使从句的动作发生在主句之后,如果强调两动作的紧密连接,也可以用现在时:"As soon as he finishes his classwork, he runs out of the class."
综上所述,as soon as 通常位于句首,引导一个时间状语从句,根据语境的不同,可以调整主从句的时态,以清晰表达动作的先后关系。
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