I am no expert in English grammar. Whenever my daughters have any English questions I always direct them to my wife. There is one rule, though, that my sixth and eighth grade teacher, Mrs. Hake, pounded into my head, the conditional tense. Anytime you begin a sentence with ‘if’ (the condition) then the verb must be ‘were’. It does not matter if your subject is singular or plural. If I were seven feet tall I would have chosen basketball as a career. Keep the conditional tense top of mind and you will be surprised how many times it is written or spoken incorrectly.