Asentence that expresses a condition that is doubtful or not factual.

Subjunctive Mood. A verb is in the subjunctive mood when it expresses a condition, which is doubtful or not factual. It is most often found in a clause beginning with the word if. ... (The verb follows if and expresses a non-factual condition.)

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Pardon me. to answer questions like this, we would have needed more information. for starters, two sentences from the excerpt that came with the question.