Grammarly Blog gave some tips on using “was” and “were” in “If” Clauses. Check out this post.
According to Grammarly Blog, an unreal Conditional Sentence expresses events that are hypothetical or improbable. If the verb in the if clause is “to be,” use “were,” even if the subject of the clause is a third person singular subject (i.e., he, she, it).
Incorrect: If I was a rich man, I would make more charitable donations.
Correct: If I were a rich man, I would make more charitable donations.
Incorrect: If he was here right now, he would help us.
Correct: If he were here right now, he would help us.
Remember, though, that this exception applies only to unreal conditionals—that is, situations that do not reflect reality.
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