主将从现 VS 主将从完

1. The moment he has arrived, I will let you know.

2. The momnet he arrives, I will let you know.

通常遇到第2句的情况比较多，请问老师第1句这样的用法和第二句有什么意思上的区别吗？

“他一来我就告诉你。”第1句是强调他一到就告诉你？

在状语从句中（尤其时间状语从句或条件状语从句），用一般现在时代替现在完成时，意思差别不大。译文基本一致，翻译时不要特意为之。

又如：

I'll report back the moment I have located him.

我一找到他就马上汇报。

来自柯林斯例句

现在完成时用在“时间状语从句”或者“条件状语从句”中，表示将来业已完成的动作或状态，代替将来完成时。例如：

1. 时间状语从句：until, as soon as, when

We can't move in until the electricity has been laid on. 我们得等电源接通后才能搬进去。

I'll go to my granny's as soon as I have finished my homework. 我一完成作业就去奶奶家。

Don't forget to switch off when you have finished. 做完之后别忘了关掉。

2. 条件状语从句：if, once, as long as

If you have finished reading the book before I leave, please lend it to me. 如果你在我离开之前就读完了这本书，请借给我。

Once we have promised, we should keep it. 一旦许下诺言，我们务必遵守。

You can watch TV as long as you have finished your homework. 只要完成了作业，你就可以看电视。

3. 偶尔还用在让步状语从句中，如：

Even though you have set the bird free, it can hardly survive. 就算将来你放了这只鸟，它也很难活。

在以上各个从句中，我们可以用一般现在时代替现在完成时，意思差别不大。

刘永科 - 教育出版集团英语总顾问 & 英语系列图书主编

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