English verb conjugation
COULD SKY

Regular verb: sky - skied - skied

Affirmation

Simple form	V-ing form
I could sky you could sky he could sky we could sky you could sky they could sky	I could be skying you could be skying he could be skying we could be skying you could be skying they could be skying
Perfect	V-ing perfect
I could have skied you could have skied he could have skied we could have skied you could have skied they could have skied	I could have been skying you could have been skying he could have been skying we could have been skying you could have been skying they could have been skying

Negation

Simple form	V-ing form
I could not sky you could not sky he could not sky we could not sky you could not sky they could not sky	I could not be skying you could not be skying he could not be skying we could not be skying you could not be skying they could not be skying
Perfect	V-ing perfect
I could not have skied you could not have skied he could not have skied we could not have skied you could not have skied they could not have skied	I could not have been skying you could not have been skying he could not have been skying we could not have been skying you could not have been skying they could not have been skying

Interrogative form

Simple form	V-ing form
could I sky? could you sky? could he sky? could we sky? could you sky? could they sky?	could I be skying? could you be skying? could he be skying? could we be skying? could you be skying? could they be skying?
Perfect	V-ing perfect
could I have skied? could you have skied? could he have skied? could we have skied? could you have skied? could they have skied?	could I have been skying? could you have been skying? could he have been skying? could we have been skying? could you have been skying? could they have been skying?

Interro-negative form

Simple form	V-ing form
could I not sky? could you not sky? could he not sky? could we not sky? could you not sky? could they not sky?	could I not be skying? could you not be skying? could he not be skying? could we not be skying? could you not be skying? could they not be skying?
Perfect	V-ing perfect
could I not have skied? could you not have skied? could he not have skied? could we not have skied? could you not have skied? could they not have skied?	could I not have been skying? could you not have been skying? could he not have been skying? could we not have been skying? could you not have been skying? could they not have been skying?