I can sputter you can sputter he can sputter we can sputter you can sputter they can sputter
V-ing form
I can be sputtering you can be sputtering he can be sputtering we can be sputtering you can be sputtering they can be sputtering
Perfect
I can have sputtered you can have sputtered he can have sputtered we can have sputtered you can have sputtered they can have sputtered
V-ing perfect
I can have been sputtering you can have been sputtering he can have been sputtering we can have been sputtering you can have been sputtering they can have been sputtering
Negation
Simple form
I can't sputter you can't sputter he can't sputter we can't sputter you can't sputter they can't sputter
V-ing form
I can't be sputtering you can't be sputtering he can't be sputtering we can't be sputtering you can't be sputtering they can't be sputtering
Perfect
I can't have sputtered you can't have sputtered he can't have sputtered we can't have sputtered you can't have sputtered they can't have sputtered
V-ing perfect
I can't have been sputtering you can't have been sputtering he can't have been sputtering we can't have been sputtering you can't have been sputtering they can't have been sputtering
Interrogative form
Simple form
can I sputter? can you sputter? can he sputter? can we sputter? can you sputter? can they sputter?
V-ing form
can I be sputtering? can you be sputtering? can he be sputtering? can we be sputtering? can you be sputtering? can they be sputtering?
Perfect
can I have sputtered? can you have sputtered? can he have sputtered? can we have sputtered? can you have sputtered? can they have sputtered?
V-ing perfect
can I have been sputtering? can you have been sputtering? can he have been sputtering? can we have been sputtering? can you have been sputtering? can they have been sputtering?
Interro-negative form
Simple form
can't I sputter? can't you sputter? can't he sputter? can't we sputter? can't you sputter? can't they sputter?
V-ing form
can't I be sputtering? can't you be sputtering? can't he be sputtering? can't we be sputtering? can't you be sputtering? can't they be sputtering?
Perfect
can't I have sputtered? can't you have sputtered? can't he have sputtered? can't we have sputtered? can't you have sputtered? can't they have sputtered?
V-ing perfect
can't I have been sputtering? can't you have been sputtering? can't he have been sputtering? can't we have been sputtering? can't you have been sputtering? can't they have been sputtering?