as soon as 引导什么从句
as soon as意思是：一……就……；一经；不久后，一会儿。用法：可以引导时间状语从句，表过去，又可以表示将来。例句：As soon as he got inside, the dog shook himself.他一进来，狗就开始摇头摆尾。
as soon as 一……就……
1、指未发生的动作。时态规律是“主将从现”，即主句用一般将来时，从句用一般现在时代替一般将来时。
I’ll tell him the plan as soon as I see him.
我一看到他就告诉他这个计划。
He’ll go home as soon as he finishes his work.
他一完成工作就回家。
2、如果强调过去发生的两个动作有先后关系，从句谓语动词可以用过去完成时。例如：
As soon asthey(had)returnedfrom London,they drove to see their sick aunt.
他们一从伦敦回来，就开车去看望他们患病的姨妈。
3、hardly…when...它的意思是“几乎未来得及做完A这件事，紧接着就开始B这件事。”
使用这个短语时，一般用于过去完成时；并且when有时可改用before。例如： He had hardly finished the article when the light went out.他刚写完文，灯就熄了。
另外，如果把hardly放于句首，主句要用倒装结构即谓语动词要提前。如：Hardly had I finished eating when he came in.我刚吃完他就进来了。
这三个短语都有“一……就”、“刚刚……就”的意思，它们的意思非常相近，因此有时可以互换。例如：
“我刚到公共汽车站，汽车就开了。”一句，就可以有如下几句译法：As soon as I got to the bus stop,the bus started.Hardly had I got to the bus stop when the bus started.No sooner had I got to the bus stop than the bus started.
但他们之间也有一些差异，例如，如果从两件事情的间隔时间来说，as soon as较长，no sooner...than居中，hardly...when间隔时间最短。
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