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 could not snowball you could not snowball he could not snowball we could not snowball you could not snowball they could not snowball	I could not be snowballing you could not be snowballing he could not be snowballing we could not be snowballing you could not be snowballing they could not be snowballing
Perfect	V-ing perfect
I could not have snowballed you could not have snowballed he could not have snowballed we could not have snowballed you could not have snowballed they could not have snowballed	I could not have been snowballing you could not have been snowballing he could not have been snowballing we could not have been snowballing you could not have been snowballing they could not 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
could I not snowball? could you not snowball? could he not snowball? could we not snowball? could you not snowball? could they not snowball?	could I not be snowballing? could you not be snowballing? could he not be snowballing? could we not be snowballing? could you not be snowballing? could they not be snowballing?
Perfect	V-ing perfect
could I not have snowballed? could you not have snowballed? could he not have snowballed? could we not have snowballed? could you not have snowballed? could they not have snowballed?	could I not have been snowballing? could you not have been snowballing? could he not have been snowballing? could we not have been snowballing? could you not have been snowballing? could they not have been snowballing?