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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
The infinitive simply names an action without reference to person, number or time. Therefore, it can't make sense without the help of a finite verb
May changes to might in subordinate clauses, when the verb in the main clause is in the past simple tense.
The conjunction that is never preceded by a comma.
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.