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In the song “Stand by Me”, we see a sentence like “when the night has come.”

I was taught that in a when clause, we use the past tense, yet the present perfect has been used in the sentence cited above. Why is that?

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I invite you to visit English Language Learners, where you may find that your questions are answered more responsively. –  StoneyB Mar 18 '13 at 11:35

2 Answers 2

Let's look at a little more context:

When the night has come and the land is dark
And the moon is the only light we see
No, I won't be afraid, oh, I won't be afraid
Just as long as you stand, stand by me

A perfect construction marks a past action as having brought about a state which is relevant at some later point: the utterance’s ‘Reference time’.

In the utterance at hand, that Reference time is defined by the main clause—I won’t be afraid—as some sort of ‘future’. (It may be an actual temporal future, or a ‘consequential’ future; that doesn’t really matter.) This future is expressed using the present tense of will, so the state of night and darkness is expressed using present constructions: The night has come, the land is dark, the moon is the only light.

The perfect construction is employed in the first phrase to signify that night is not in the process of falling: it is not dusk, when light is fading, but already full night, when the light is gone. The state of night is fully realized.

When everything is dark I will not be afraid.

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I wish to say that Stoney's answer is the one I would vote for. So, my answer is but chipping in my 2 cts.

We could look at this with the event-state flow diagram.

An example of event-state is

[crate, state: empty, waiting]
  -> [operator, event: fills crate]
     -> [crate, state: filled]
       -> [move-button, event: press move crate button]
         ->[crate, state: moved]

When the state of the crate is filled, it means that the fill-crate event has completed, aka perfected.

[event: night comes]
 ->[state: land is dark]

Therefore, when state = [land is dark], it means the event [night comes] has completed, i.e., the night has come.

Therefore, when using the present perfection of events, it is used in conjunction with present states and future possibilities.

  • Pope John Paul has been beatified. He is now a saint. Many people will venerate him.
  • Mary has removed her shoes. Her toes are visible. She will be tip-toeing.
  • George has killed himself. He is dead. He won't be attending my wedding.
  • Mikey has arisen. He is alive. He won't be in the grave.

The event completion need not be related to any arbitrary present states that may be stated in conjunction of each other.

  • Today is March 18. We have sold the car. Our neighbours are celebrating their son's birthday. Their dog will be twelve next year.
  • It is 10 am. The salsa has spoiled. The tortilla chips are delicious. We won't think about the vodka tonight.
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thank you very much for your help! –  박용현 Mar 21 '13 at 11:49

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