I'll be trephining you'll be trephining he'll be trephining we'll be trephining you'll be trephining they'll be trephining
Future perfect
I'll have trephined you'll have trephined he'll have trephined we'll have trephined you'll have trephined they'll have trephined
Future perfect continuous
I'll have been trephining you'll have been trephining he'll have been trephining we'll have been trephining you'll have been trephining they'll have been trephining
I'd be trephining you'd be trephining he'd be trephining we'd be trephining you'd be trephining they'd be trephining
Past
I'd have trephined you'd have trephined he'd have trephined we'd have trephined you'd have trephined they'd have trephined
Past continuous
I'd have been trephining you'd have been trephining he'd have been trephining we'd have been trephining you'd have been trephining they'd have been trephining