Although was is very common in these cases, it should be were , regardless of the number of the subject. I'm sure that very few people from the US who have studied a Romance Language make this error. It is a remnant of the subjunctive mood in older English, used in instances of "contrary to fact".
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AnonymousWhen do you user 'were' instead of 'was'?In certain conditional structures you have two clauses: an if clause and a main clause with would. In that kind of structure use were in the if clause, but keep in mind that a lot of people use was instead.