"Once I receive ... " vs "Once I received ... "

[hampeh]

Dear teachers and friends, What is the difference between the following sentences and which one is the correct one?1. Once I receive …2. Once I received …3. Once I’ve received …Thanks in advance

 

[5jj]

Please give us the complete sentence.

 

[Rover_KE]

It depends on how the sentence is going to end.

 

[hampeh]

Thanks for your prompt response. The complete sentences are as follows:

Once I receive John’s approval, I will have your request processed.
Once I received John’s approval, I will have your request processed.
Once I’ve received John’s approval, I will have your request processed.

 

[5jj]

Once I receive John’s approval, I will have your request processed. :tick:
Once I received John’s approval, I will have your request processed.:cross:
Once I’ve received John’s approval, I will have your request processed. :tick:

Ther is no real difference between the two correct versions. In the last one, I would not contract 'have' in a formal letter.