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If the verb in the main clause is in the future, the verb in the time clause must be in the present tense
Don't use must and ought to as past tenses. To express a past duty (which wasn't done) use the perfect infinitive without to after ought to or should, or expressions such as had to, was obliged to.
In indirect speech use must and ought to as past tenses: He said he must do it.
After the verbs can, must, may, shall, and will, use the infinitive without to , and not the third person of the present.