English verb conjugation
CAN SKY

Regular verb: sky - skied - skied

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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