Looking on the internet deeply has found these results:

what was happened yesterday is the most popular phrase on the web.

what was happening yeasterday 10 results on the web	what was happened yesterday 13 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.	those ergatives without a transitive counterpart the kind of structure found in the IL: (22) *What was happened yesterday? (23) The leaves were fallen down. May 10, 2012 ...* Because we can't even remember fully what was happened yesterday.so i think so its different body and different situation so we remember�... Sep 27, 2015 ... Can't moved on of what was happened yesterday! it's a day to remember ! whoaaa! 0 retweets 1 like. Reply. Retweet. Retweeted. Like. 1. Liked.

what was happening yeasterday

10 results on the web

what was happened yesterday

13 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.

those ergatives without a transitive counterpart
the kind of structure found in the IL: (22) *What was happened yesterday? (23) *The leaves were fallen down.
May 10, 2012 ... Because we can't even remember fully what was happened yesterday.so i think so its different body and different situation so we remember�...
Sep 27, 2015 ... Can't moved on of what was happened yesterday! it's a day to remember ! whoaaa! 0 retweets 1 like. Reply. Retweet. Retweeted. Like. 1. Liked.