can ski
Verbo regular: ski - skied- skied

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can ski
you can ski
he can ski
we can ski
you can ski
they can ski 	I can be skiing
you can be skiing
he can be skiing
we can be skiing
you can be skiing
they can be skiing	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 skiing
you can have been skiing
he can have been skiing
we can have been skiing
you can have been skiing
they can have been skiing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can't ski
you can't ski
he can't ski
we can't ski
you can't ski
they can't ski 	I can't be skiing
you can't be skiing
he can't be skiing
we can't be skiing
you can't be skiing
they can't be skiing	I can't have skied
you can't have skied
he can't have skied
we can't have skied
you can't have skied
they can't have skied	I can't have been skiing
you can't have been skiing
he can't have been skiing
we can't have been skiing
you can't have been skiing
they can't have been skiing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I ski?
can you ski?
can he ski?
can we ski?
can you ski?
can they ski? 	can I be skiing?
can you be skiing?
can he be skiing?
can we be skiing?
can you be skiing?
can they be skiing? 	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 skiing?
can you have been skiing?
can he have been skiing?
can we have been skiing?
can you have been skiing?
can they have been skiing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can't I ski?
can't you ski?
can't he ski?
can't we ski?
can't you ski?
can't they ski? 	can't I be skiing?
can't you be skiing?
can't he be skiing?
can't we be skiing?
can't you be skiing?
can't they be skiing? 	can't I have skied?
can't you have skied?
can't he have skied?
can't we have skied?
can't you have skied?
can't they have skied? 	can't I have been skiing?
can't you have been skiing?
can't he have been skiing?
can't we have been skiing?
can't you have been skiing?
can't they have been skiing?