English verb conjugation
COULD SNOWBOARD

Regular verb: snowboard - snowboarded - snowboarded

Affirmation

Simple form	V-ing form
I could snowboard you could snowboard he could snowboard we could snowboard you could snowboard they could snowboard	I could be snowboarding you could be snowboarding he could be snowboarding we could be snowboarding you could be snowboarding they could be snowboarding
Perfect	V-ing perfect
I could have snowboarded you could have snowboarded he could have snowboarded we could have snowboarded you could have snowboarded they could have snowboarded	I could have been snowboarding you could have been snowboarding he could have been snowboarding we could have been snowboarding you could have been snowboarding they could have been snowboarding

Negation

Simple form	V-ing form
I could not snowboard you could not snowboard he could not snowboard we could not snowboard you could not snowboard they could not snowboard	I could not be snowboarding you could not be snowboarding he could not be snowboarding we could not be snowboarding you could not be snowboarding they could not be snowboarding
Perfect	V-ing perfect
I could not have snowboarded you could not have snowboarded he could not have snowboarded we could not have snowboarded you could not have snowboarded they could not have snowboarded	I could not have been snowboarding you could not have been snowboarding he could not have been snowboarding we could not have been snowboarding you could not have been snowboarding they could not have been snowboarding

Interrogative form

Simple form	V-ing form
could I snowboard? could you snowboard? could he snowboard? could we snowboard? could you snowboard? could they snowboard?	could I be snowboarding? could you be snowboarding? could he be snowboarding? could we be snowboarding? could you be snowboarding? could they be snowboarding?
Perfect	V-ing perfect
could I have snowboarded? could you have snowboarded? could he have snowboarded? could we have snowboarded? could you have snowboarded? could they have snowboarded?	could I have been snowboarding? could you have been snowboarding? could he have been snowboarding? could we have been snowboarding? could you have been snowboarding? could they have been snowboarding?

Interro-negative form

Simple form	V-ing form
could I not snowboard? could you not snowboard? could he not snowboard? could we not snowboard? could you not snowboard? could they not snowboard?	could I not be snowboarding? could you not be snowboarding? could he not be snowboarding? could we not be snowboarding? could you not be snowboarding? could they not be snowboarding?
Perfect	V-ing perfect
could I not have snowboarded? could you not have snowboarded? could he not have snowboarded? could we not have snowboarded? could you not have snowboarded? could they not have snowboarded?	could I not have been snowboarding? could you not have been snowboarding? could he not have been snowboarding? could we not have been snowboarding? could you not have been snowboarding? could they not have been snowboarding?