
Samuel P. answered 08/07/19
Masters student in English and former teacher
At this point, they both work. The 'weren't' version that you're hitting on is the traditional form of what's called the subjunctive mood. You may have heard this phrase if you've taken a romance language. The subjunctive is a way to conjugate verbs based upon their unreality. So, verbs that express demand, hope, wish, or possibility that is untethered to reality. There are a few different forms of the subjunctive that can be used. 'Weren't' is (what I think) is called a simple. By now though, that form is pretty much done in English, or at least on the decline. So 'wasn't' works just as well. 'Wasn't' is going to be a conjugation in the indicative mood used in what was formerly the domain of the subjunctive.