Looking on the internet deeply has found these results:

i was working is the most popular phrase on the web.

I were working 140,000 results on the web	i was working 169,500,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
butyllithium... I've pretty obsessively covered the UCLA/ Sheharbano "Sheri" Sangji case with two hats: as a blogger ... May 11, 2009 ... If I were working with tert I was working, I were working. you were working, you were working. he was working, he were working. she was working, she were working. it was working, it ... A long time ago, I was in Burma. My friends and I were working for the local government. They were trying to buy the loyalty of tribal leaders by bribing them with ... Feb 1, 2012 ... Neil Young: Steve Jobs and I were working on new iPod. Singer tells technology conference he and the late Apple boss planned audiophile ...	It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

I were working

140,000 results on the web

i was working

169,500,000 results on the web

More popular!

butyllithium... I've pretty obsessively covered the UCLA/ Sheharbano "Sheri" Sangji case with two hats: as a blogger ...
May 11, 2009 ... If I were working with tert
I was working, I were working. you were working, you were working. he was working, he were working. she was working, she were working. it was working, it ...
A long time ago, I was in Burma. My friends and I were working for the local government. They were trying to buy the loyalty of tribal leaders by bribing them with ...
Feb 1, 2012 ... Neil Young: Steve Jobs and I were working on new iPod. Singer tells technology conference he and the late Apple boss planned audiophile ...

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