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Don't use the past perfect unless there is another verb in the past tense in the same sentence.
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.
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
The verb to use doesn't express a habit in the present. I use means I employ: I use a pen to write with.
Used to expresses a past state or habit and it usually refers to some old situation which no longer exists: I used to see him every day; My father used to play football very well.