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Anonymous Posted 12 years ago
Grammar

British American difference I think

Could both an British and American tell me which is correct?

When the drug has proven to work, I will be able to prescribe it.
When the drug is proven to work, I will be able to prescribe it.
When the drug has proved to work, I will be able to prescribe it.
When the drug is proved to work, I will be able to prescribe it.
When the drug has been proven to work, I will be able to prescribe it.
When the drug has been proved to work, I will be able to prescribe it.

Thank you
  

Top answer

These are OK: When the drug is proven to work, I will be able to prescribe it. When the drug is proved to work, I will be able to prescribe it. When the drug has been proven to work, I will be able to prescribe it.

— Mister Micawber

  • These are OK: When the drug is proven to work, I will be able to prescribe it.
  • When the drug is proved to work, I will be able to prescribe it.
  • When the drug has been proven to work, I will be able to prescribe it.
  • When the drug has been proved to work, I will be able to prescribe it.
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1 Answers
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These are OK:

When the drug is proven to work, I will be able to prescribe it.
When the drug is proved to work, I will be able to prescribe it.
When the drug has been proven to work, I will be able to prescribe it.
When the drug has been proved to work, I will be able to prescribe it.
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