[Grammar] The present perfect

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Kazuo

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Joined
Feb 25, 2010
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Japanese
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Japan
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Japan
Hello!

A caution (on a library book)
This book must be returned on or before the date last marked below unless permission to renew has been obtained.

In the sentence above, is the use of the present perfect mandatory?
Instead, is it acceptable to say unless permission to renew is obtained, or unless permission to renew is yet complete?

Thanks in advance
 

bertietheblue

Senior Member
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May 21, 2010
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Other
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English
Home Country
UK
Current Location
UK
Hello!

A caution (on a library book)
This book must be returned on or before the date last marked below unless permission to renew has been obtained.

In the sentence above, is the use of the present perfect mandatory?
Instead, is it acceptable to say unless permission to renew is obtained - yes, though I'd prefer 'is first obtained', or unless permission to renew is yet complete - no, you don't 'complete a permission'?

Thanks in advance


Bertie
 
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