English verb conjugation
COULD SNOWBALL

Regular verb: snowball - snowballed - snowballed

Affirmation

Simple form	V-ing form
I could snowball you could snowball he could snowball we could snowball you could snowball they could snowball	I could be snowballing you could be snowballing he could be snowballing we could be snowballing you could be snowballing they could be snowballing
Perfect	V-ing perfect
I could have snowballed you could have snowballed he could have snowballed we could have snowballed you could have snowballed they could have snowballed	I could have been snowballing you could have been snowballing he could have been snowballing we could have been snowballing you could have been snowballing they could have been snowballing

Negation

Simple form	V-ing form
I couldn't snowball you couldn't snowball he couldn't snowball we couldn't snowball you couldn't snowball they couldn't snowball	I couldn't be snowballing you couldn't be snowballing he couldn't be snowballing we couldn't be snowballing you couldn't be snowballing they couldn't be snowballing
Perfect	V-ing perfect
I couldn't have snowballed you couldn't have snowballed he couldn't have snowballed we couldn't have snowballed you couldn't have snowballed they couldn't have snowballed	I couldn't have been snowballing you couldn't have been snowballing he couldn't have been snowballing we couldn't have been snowballing you couldn't have been snowballing they couldn't have been snowballing

Interrogative form

Simple form	V-ing form
could I snowball? could you snowball? could he snowball? could we snowball? could you snowball? could they snowball?	could I be snowballing? could you be snowballing? could he be snowballing? could we be snowballing? could you be snowballing? could they be snowballing?
Perfect	V-ing perfect
could I have snowballed? could you have snowballed? could he have snowballed? could we have snowballed? could you have snowballed? could they have snowballed?	could I have been snowballing? could you have been snowballing? could he have been snowballing? could we have been snowballing? could you have been snowballing? could they have been snowballing?

Interro-negative form

Simple form	V-ing form
couldn't I snowball? couldn't you snowball? couldn't he snowball? couldn't we snowball? couldn't you snowball? couldn't they snowball?	couldn't I be snowballing? couldn't you be snowballing? couldn't he be snowballing? couldn't we be snowballing? couldn't you be snowballing? couldn't they be snowballing?
Perfect	V-ing perfect
couldn't I have snowballed? couldn't you have snowballed? couldn't he have snowballed? couldn't we have snowballed? couldn't you have snowballed? couldn't they have snowballed?	couldn't I have been snowballing? couldn't you have been snowballing? couldn't he have been snowballing? couldn't we have been snowballing? couldn't you have been snowballing? couldn't they have been snowballing?