could ski
Verbo regular: ski - skied- skied

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could ski
you could ski
he could ski
we could ski
you could ski
they could ski 	I could be skiing
you could be skiing
he could be skiing
we could be skiing
you could be skiing
they could be skiing	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 skiing
you could have been skiing
he could have been skiing
we could have been skiing
you could have been skiing
they could have been skiing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't ski
you couldn't ski
he couldn't ski
we couldn't ski
you couldn't ski
they couldn't ski 	I couldn't be skiing
you couldn't be skiing
he couldn't be skiing
we couldn't be skiing
you couldn't be skiing
they couldn't be skiing	I couldn't have skied
you couldn't have skied
he couldn't have skied
we couldn't have skied
you couldn't have skied
they couldn't have skied	I couldn't have been skiing
you couldn't have been skiing
he couldn't have been skiing
we couldn't have been skiing
you couldn't have been skiing
they couldn't have been skiing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I ski?
could you ski?
could he ski?
could we ski?
could you ski?
could they ski? 	could I be skiing?
could you be skiing?
could he be skiing?
could we be skiing?
could you be skiing?
could they be skiing? 	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 skiing?
could you have been skiing?
could he have been skiing?
could we have been skiing?
could you have been skiing?
could they have been skiing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I ski?
couldn't you ski?
couldn't he ski?
couldn't we ski?
couldn't you ski?
couldn't they ski? 	couldn't I be skiing?
couldn't you be skiing?
couldn't he be skiing?
couldn't we be skiing?
couldn't you be skiing?
couldn't they be skiing? 	couldn't I have skied?
couldn't you have skied?
couldn't he have skied?
couldn't we have skied?
couldn't you have skied?
couldn't they have skied? 	couldn't I have been skiing?
couldn't you have been skiing?
couldn't he have been skiing?
couldn't we have been skiing?
couldn't you have been skiing?
couldn't they have been skiing?