I'll be sputtering you'll be sputtering he'll be sputtering we'll be sputtering you'll be sputtering they'll be sputtering
Future perfect
I'll have sputtered you'll have sputtered he'll have sputtered we'll have sputtered you'll have sputtered they'll have sputtered
Future perfect continuous
I'll have been sputtering you'll have been sputtering he'll have been sputtering we'll have been sputtering you'll have been sputtering they'll have been sputtering
I'd be sputtering you'd be sputtering he'd be sputtering we'd be sputtering you'd be sputtering they'd be sputtering
Past
I'd have sputtered you'd have sputtered he'd have sputtered we'd have sputtered you'd have sputtered they'd have sputtered
Past continuous
I'd have been sputtering you'd have been sputtering he'd have been sputtering we'd have been sputtering you'd have been sputtering they'd have been sputtering