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I'm a little confused with the subjunctive in tenses with no subjunctive forms, for example the preterite. How would you say 'I'm not sure if he did it'? Would it be the imperfect subjunctive?
Yes when your sentence is in the past say preterite, perfect or imperfect you still need the imperfect subjuntive. If the sentence is in the present use the present subjunctive as a general rule.