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We also use the present continuous for the future when something is pre-arranged or expected with some certainty: Lorna is arriving tomorrow at six. Tom and I are eating out tonight
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.
Use the present perfect (and not the simple present) for an action begun in the past and continuing into the present. I've been at this school two years means I'm still here.
Will changes to would in subordinate causes, when the verb in the main clause is in a past tense.