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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.
Don't use the past perfect unless there is another verb in the past tense in the same sentence.
If the verb in the main clause is in the future, the verb in the time clause must be in the present tense
Can changes to could in subordinate clauses, when the verb in the main clause is in the past simple tense.
When the verb in the main clause is in the past tense, use a past tense in subordinate clauses.
This rule doesn't apply (1) to verbs within quotations, (2) to facts that are true at all times. We say:
1. She said, 'I am waiting for your answer'
2. He said that London is a great city