Looking on the internet deeply has found these results:

if it will happen is the most popular phrase on the web.

if it happened and you have spare time 10 results on the web	if it will happen 147,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	Jun 25, 2015 ... A new arena is not a matter of if it will happen, just when. Billionaires tend to like things of their own because they can afford them and Tony�... Guys. In our ever Dec 8, 2009 ... The Pain Was Greater If It Will Happen Again: The Effect of Anticipated Continuation on Retrospective Discomfort. Jeff Galak. Carnegie Mellon�... IT Data Breaches: Being Prepared for When (Not If) it Will Happen to You. by Guest Blogger, June 23, 2015 � Data The Pain Was Greater If It Will Happen Again: The. Effect of Anticipated Continuation on. Retrospective Discomfort. Jeffrey Galak. Carnegie Mellon University�... more Breach

if it happened and you have spare time

10 results on the web

if it will happen

147,000 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

Jun 25, 2015 ... A new arena is not a matter of if it will happen, just when. Billionaires tend to like things of their own because they can afford them and Tony�...
Guys. In our ever
Dec 8, 2009 ... The Pain Was Greater If It Will Happen Again: The Effect of Anticipated Continuation on Retrospective Discomfort. Jeff Galak. Carnegie Mellon�...
IT
Data Breaches: Being Prepared for When (Not If) it Will Happen to You. by Guest Blogger, June 23, 2015 � Data
The Pain Was Greater If It Will Happen Again: The. Effect of Anticipated Continuation on. Retrospective Discomfort. Jeffrey Galak. Carnegie Mellon University�...
more
Breach