can sky
Regular verb: sky - skied- skied

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