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PreciousJones Posted 15 years ago
Grammar

Once

Please call me back once you hear this message. Or

Please call me back one you've heard this message.

Are both useable?

Is there a difference?
  

Top answer

Please call me back once you hear this message. Okay! Please call me back one you've heard this message.

— Avangi

  • Please call me back once you hear this message.
  • Okay!
  • Please call me back one you've heard this message.
  • No good!
  • ) "Once" is an adverb.
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4 Answers
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Please call me back once you hear this message. Okay!

Please call me back one you've heard this message. No good!

(Please call me back when you've heard this message.)

"Once" is a
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Please call me back once you've heard this message - Would this be okay then?


sorry that was a typo.
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Sure! That's fine.Emotion: smile

In some cases there can be a difference between "when you do" and "when you have done,"

but in
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PreciousJonesPlease call me back once you hear this message. Or
Please call me back once you've heard this message.
I agree with Avangi. No difference. This effect is very common in a subordinate clause of time that is about a future event. You can use either the present or the present perfect with no real difference in meaning. The present perfect is p
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