could warn
Verbo regular: warn - warned- warned

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could warn
you could warn
he could warn
we could warn
you could warn
they could warn 	I could be warning
you could be warning
he could be warning
we could be warning
you could be warning
they could be warning	I could have warned
you could have warned
he could have warned
we could have warned
you could have warned
they could have warned	I could have been warning
you could have been warning
he could have been warning
we could have been warning
you could have been warning
they could have been warning	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't warn
you couldn't warn
he couldn't warn
we couldn't warn
you couldn't warn
they couldn't warn 	I couldn't be warning
you couldn't be warning
he couldn't be warning
we couldn't be warning
you couldn't be warning
they couldn't be warning	I couldn't have warned
you couldn't have warned
he couldn't have warned
we couldn't have warned
you couldn't have warned
they couldn't have warned	I couldn't have been warning
you couldn't have been warning
he couldn't have been warning
we couldn't have been warning
you couldn't have been warning
they couldn't have been warning	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I warn?
could you warn?
could he warn?
could we warn?
could you warn?
could they warn? 	could I be warning?
could you be warning?
could he be warning?
could we be warning?
could you be warning?
could they be warning? 	could I have warned?
could you have warned?
could he have warned?
could we have warned?
could you have warned?
could they have warned? 	could I have been warning?
could you have been warning?
could he have been warning?
could we have been warning?
could you have been warning?
could they have been warning? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I warn?
couldn't you warn?
couldn't he warn?
couldn't we warn?
couldn't you warn?
couldn't they warn? 	couldn't I be warning?
couldn't you be warning?
couldn't he be warning?
couldn't we be warning?
couldn't you be warning?
couldn't they be warning? 	couldn't I have warned?
couldn't you have warned?
couldn't he have warned?
couldn't we have warned?
couldn't you have warned?
couldn't they have warned? 	couldn't I have been warning?
couldn't you have been warning?
couldn't he have been warning?
couldn't we have been warning?
couldn't you have been warning?
couldn't they have been warning?