Looking on the internet deeply has found these results:

should not have happened is the most popular phrase on the web.

should not be happened 130,800 results on the web	should not have happened 135,700 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Whatever happened, it must have happened quickly. You should not have happened to be at lunch Arabellin�mi with parents? Work happened later, marriage happened later, kids happened later, even death happened later. What happened was just something that happened. Whatever happened to these power lines happened after the snow monster. What happened to him could've happened to any qualified pilot. Privacy should not be compromised as happened in the case of the Harbour Report. What happened last night has never happened.	with the�... Aug 28, 2015 ... This murder should not have happened. There was prior knowledge, even expectations, that such a person might do it again. The automatic�... 20 Movie Sequels That Should Not Have Happened 20 Movie Sequels That Should Not Have Happened Many times, Hollywood movie sequels just try to�... Mar 11, 2014 ... I'm looking for a word to mean "should not have happened." I'm trying to relate this situation; two paths one positive, one negative If you say that something should not have happened, you mean that it did happen , but that you wish it had not. I should have gone this morning but I was feeling�...

should not be happened

130,800 results on the web

should not have happened

135,700 results on the web

More popular!

Whatever happened, it must have happened quickly.
You should not have happened to be at lunch Arabellin�mi with parents?
Work happened later, marriage happened later, kids happened later, even death happened later.
What happened was just something that happened.
Whatever happened to these power lines happened after the snow monster.
What happened to him could've happened to any qualified pilot.
Privacy should not be compromised as happened in the case of the Harbour Report.
What happened last night has never happened.

with the�...
Aug 28, 2015 ... This murder should not have happened. There was prior knowledge, even expectations, that such a person might do it again. The automatic�...
20 Movie Sequels That Should Not Have Happened 20 Movie Sequels That Should Not Have Happened Many times, Hollywood movie sequels just try to�...
Mar 11, 2014 ... I'm looking for a word to mean "should not have happened." I'm trying to relate this situation; two paths
one positive, one negative
If you say that something should not have happened, you mean that it did happen , but that you wish it had not. I should have gone this morning but I was feeling�...