I can sputter you can sputter she can sputter we can sputter you can sputter they can sputter
V-ing form
I can be sputtering you can be sputtering she can be sputtering we can be sputtering you can be sputtering they can be sputtering
Perfect
I can have sputtered you can have sputtered she 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 she can have been sputtering we can have been sputtering you can have been sputtering they can have been sputtering
Negation
Simple form
I cannot sputter you cannot sputter she cannot sputter we cannot sputter you cannot sputter they cannot sputter
V-ing form
I cannot be sputtering you cannot be sputtering she cannot be sputtering we cannot be sputtering you cannot be sputtering they cannot be sputtering
Perfect
I cannot have sputtered you cannot have sputtered she cannot have sputtered we cannot have sputtered you cannot have sputtered they cannot have sputtered
V-ing perfect
I cannot have been sputtering you cannot have been sputtering she cannot have been sputtering we cannot have been sputtering you cannot have been sputtering they cannot have been sputtering
Interrogative form
Simple form
can I sputter? can you sputter? can she sputter? can we sputter? can you sputter? can they sputter?
V-ing form
can I be sputtering? can you be sputtering? can she be sputtering? can we be sputtering? can you be sputtering? can they be sputtering?
Perfect
can I have sputtered? can you have sputtered? can she 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 she have been sputtering? can we have been sputtering? can you have been sputtering? can they have been sputtering?
Interro-negative form
Simple form
can I not sputter? can you not sputter? can she not sputter? can we not sputter? can you not sputter? can they not sputter?
V-ing form
can I not be sputtering? can you not be sputtering? can she not be sputtering? can we not be sputtering? can you not be sputtering? can they not be sputtering?
Perfect
can I not have sputtered? can you not have sputtered? can she not have sputtered? can we not have sputtered? can you not have sputtered? can they not have sputtered?
V-ing perfect
can I not have been sputtering? can you not have been sputtering? can she not have been sputtering? can we not have been sputtering? can you not have been sputtering? can they not have been sputtering?