If only + present / future tense expresses “hope”.
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If only he will come on time.
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If only he listens to her.
If only + past / past perfect tense expresses “regret”.
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If only he didn’t smoke.
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If only you have not said that.
If only + would can express regret about present action.
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If only he would drive slowly.
Subjunctive mood The subjunctive mood is the simple form of the verb when it is used after certain verbs indicating that one person
wants another person to do something. The word “that” must always appear in subjunctive sentences.