I'd been altering you'd been altering he'd been altering we'd been altering you'd been altering they'd been altering
Futuro simple
I'll alter you'll alter he'll alter we'll alter you'll alter they'll alter
Futuro continuo
I'll be altering you'll be altering he'll be altering we'll be altering you'll be altering they'll be altering
Futuro perfecto
I'll have altered you'll have altered he'll have altered we'll have altered you'll have altered they'll have altered
Futuro perfecto contínuo
I'll have been altering you'll have been altering he'll have been altering we'll have been altering you'll have been altering they'll have been altering
Condicional
Presente
I'd alter you'd alter he'd alter we'd alter you'd alter they'd alter
Presente continuo
I'd be altering you'd be altering he'd be altering we'd be altering you'd be altering they'd be altering
Passado
I'd have altered you'd have altered he'd have altered we'd have altered you'd have altered they'd have altered
Passado continuo
I'd have been altering you'd have been altering he'd have been altering we'd have been altering you'd have been altering they'd have been altering