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Hotmale Posted 12 years ago
Grammar

Future Simple after "if" and "when"

Hi, I've been reading a text and one thing drew my attention, maily the use of the Future Simple after "when" and "if".
Can you please tell me why the Future Simple is used instead of the Present Simple? Is it an exception to the rule?

"Each time the mountain has settled down without a major eruption, although some activity has continued. Yet when, or if, a major eruption will occur next remains unknown."

Thank you
  

Top answer

We have here a form of indirect question, not a temporal/conditional clause. When will it occur? I don't know when it will occur.

  • We have here a form of indirect question, not a temporal/conditional clause.
  • When will it occur?
  • I don't know when it will occur.
  • Yet when, or if, a major eruption will occur next remains unknown.
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2 Answers
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We have here a form of indirect question, not a temporal/conditional clause.

When will it occur?
I don't know when it will occur.
Yet when, or if, a major eruption will occur next remains unknown.

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