could sweeten
Verbo regular: sweeten - sweetened- sweetened

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could sweeten
you could sweeten
he could sweeten
we could sweeten
you could sweeten
they could sweeten 	I could be sweetening
you could be sweetening
he could be sweetening
we could be sweetening
you could be sweetening
they could be sweetening	I could have sweetened
you could have sweetened
he could have sweetened
we could have sweetened
you could have sweetened
they could have sweetened	I could have been sweetening
you could have been sweetening
he could have been sweetening
we could have been sweetening
you could have been sweetening
they could have been sweetening	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not sweeten
you could not sweeten
he could not sweeten
we could not sweeten
you could not sweeten
they could not sweeten 	I could not be sweetening
you could not be sweetening
he could not be sweetening
we could not be sweetening
you could not be sweetening
they could not be sweetening	I could not have sweetened
you could not have sweetened
he could not have sweetened
we could not have sweetened
you could not have sweetened
they could not have sweetened	I could not have been sweetening
you could not have been sweetening
he could not have been sweetening
we could not have been sweetening
you could not have been sweetening
they could not have been sweetening	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I sweeten?
could you sweeten?
could he sweeten?
could we sweeten?
could you sweeten?
could they sweeten? 	could I be sweetening?
could you be sweetening?
could he be sweetening?
could we be sweetening?
could you be sweetening?
could they be sweetening? 	could I have sweetened?
could you have sweetened?
could he have sweetened?
could we have sweetened?
could you have sweetened?
could they have sweetened? 	could I have been sweetening?
could you have been sweetening?
could he have been sweetening?
could we have been sweetening?
could you have been sweetening?
could they have been sweetening? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not sweeten?
could you not sweeten?
could he not sweeten?
could we not sweeten?
could you not sweeten?
could they not sweeten? 	could I not be sweetening?
could you not be sweetening?
could he not be sweetening?
could we not be sweetening?
could you not be sweetening?
could they not be sweetening? 	could I not have sweetened?
could you not have sweetened?
could he not have sweetened?
could we not have sweetened?
could you not have sweetened?
could they not have sweetened? 	could I not have been sweetening?
could you not have been sweetening?
could he not have been sweetening?
could we not have been sweetening?
could you not have been sweetening?
could they not have been sweetening?