The form for the Subjunctive and Ojalá is the required 3-part formula.
Ojalá que...
Present Subjunctive is used when what you are wishing is still (however remotely) possible: |
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| Ojalá que Mauricio venga a clase temprano. | I sure hope that (God willing) Mauricio comes to class early. [unlikely, but he still may] |
| Ojalá que gane la lotería. | I sure pray (May God will that) I win the lottery [unlikely, but who knows?] |
The Imperfect (Past) Subjunctive is used when expressing a wish for something that is not possible. For example, Wishing to redo the past or transform yourself into another creature: |
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| Ojalá que Mauricio viniera a clase temprano. | I really wished that (if only God willed that) Mauricio came to class early [but he didn't] |
| Ojalá que ganara la lotería. | I really wish (if only God willed that) I had won the lottery [but, alas, I did not] |