If I had used vs If I have used

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Looking on the internet deeply has found these results:

If I had used is the most popular phrase on the web. 

If I have used

142,000 results on the web

If I had used

146,200 results on the web

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Some examples and use cases from the internet:

Some examples and use cases from the internet:

  • You are here. Department » Police » FAQ » Austin Police Department Recruiting » Can I apply if I have used marijuana or other drugs/narcotics in the past?
  • Apr 16, 2014 ... Would you tell me if I have used EMPHATIC ADVERB correctly? up vote 1 down vote favorite. Do you have your driving licence with yourself?
  • 4 days ago ... if i have used someone elses apple id to download an app, will it erase when i update my phone on itunes? No problem. We won't show you ...
  • Can I donate blood if I have used intravenous drugs? Topics · Heart and Circulatory System · Blood Basics. Can I donate blood if I have used intravenous drugs?
  • If I had used a three day treatment it would already be gone by now. But alas, I tried to save time and instead wasted time AND money. Please ladies... do not ...
  • Mar 10, 2015 ... Hillary Clinton: 'It would have been better' if I had used a second email account – video. Play. Current Time 0:00. /. Duration Time 2:29.
  • Jan 9, 2015 ... Best Answer: "If I had used my earphone carefully, I wouldn't have broken it." : This is correct grammar. "If I would have used my earphone ...
  • (I am unsure whether you are going to ask so I hedge my bets by using an 'unreal ' conditional; if I had used I'm sure my mother will help instead, this gives the ...

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