"I do" - I did, "I'm doing" - I was doing, "I've done, I did" - I'd done, "I was doing" - I'd been doing, "I'd done, I'd been doing" - no change, "will" - would, "is going to"  - was going to, "can" - could, "must" - had to, "would, may, might" - would, may, might,

Backshift in reported speech

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