could caution
Verbo regular: caution - cautioned- cautioned

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could caution
you could caution
she could caution
we could caution
you could caution
they could caution 	I could be cautioning
you could be cautioning
she could be cautioning
we could be cautioning
you could be cautioning
they could be cautioning	I could have cautioned
you could have cautioned
she could have cautioned
we could have cautioned
you could have cautioned
they could have cautioned	I could have been cautioning
you could have been cautioning
she could have been cautioning
we could have been cautioning
you could have been cautioning
they could have been cautioning	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't caution
you couldn't caution
she couldn't caution
we couldn't caution
you couldn't caution
they couldn't caution 	I couldn't be cautioning
you couldn't be cautioning
she couldn't be cautioning
we couldn't be cautioning
you couldn't be cautioning
they couldn't be cautioning	I couldn't have cautioned
you couldn't have cautioned
she couldn't have cautioned
we couldn't have cautioned
you couldn't have cautioned
they couldn't have cautioned	I couldn't have been cautioning
you couldn't have been cautioning
she couldn't have been cautioning
we couldn't have been cautioning
you couldn't have been cautioning
they couldn't have been cautioning	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I caution?
could you caution?
could she caution?
could we caution?
could you caution?
could they caution? 	could I be cautioning?
could you be cautioning?
could she be cautioning?
could we be cautioning?
could you be cautioning?
could they be cautioning? 	could I have cautioned?
could you have cautioned?
could she have cautioned?
could we have cautioned?
could you have cautioned?
could they have cautioned? 	could I have been cautioning?
could you have been cautioning?
could she have been cautioning?
could we have been cautioning?
could you have been cautioning?
could they have been cautioning? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I caution?
couldn't you caution?
couldn't she caution?
couldn't we caution?
couldn't you caution?
couldn't they caution? 	couldn't I be cautioning?
couldn't you be cautioning?
couldn't she be cautioning?
couldn't we be cautioning?
couldn't you be cautioning?
couldn't they be cautioning? 	couldn't I have cautioned?
couldn't you have cautioned?
couldn't she have cautioned?
couldn't we have cautioned?
couldn't you have cautioned?
couldn't they have cautioned? 	couldn't I have been cautioning?
couldn't you have been cautioning?
couldn't she have been cautioning?
couldn't we have been cautioning?
couldn't you have been cautioning?
couldn't they have been cautioning?