can unfasten
Verbo regular: unfasten - unfastened- unfastened

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can unfasten
you can unfasten
she can unfasten
we can unfasten
you can unfasten
they can unfasten 	I can be unfastening
you can be unfastening
she can be unfastening
we can be unfastening
you can be unfastening
they can be unfastening	I can have unfastened
you can have unfastened
she can have unfastened
we can have unfastened
you can have unfastened
they can have unfastened	I can have been unfastening
you can have been unfastening
she can have been unfastening
we can have been unfastening
you can have been unfastening
they can have been unfastening	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot unfasten
you cannot unfasten
she cannot unfasten
we cannot unfasten
you cannot unfasten
they cannot unfasten 	I cannot be unfastening
you cannot be unfastening
she cannot be unfastening
we cannot be unfastening
you cannot be unfastening
they cannot be unfastening	I cannot have unfastened
you cannot have unfastened
she cannot have unfastened
we cannot have unfastened
you cannot have unfastened
they cannot have unfastened	I cannot have been unfastening
you cannot have been unfastening
she cannot have been unfastening
we cannot have been unfastening
you cannot have been unfastening
they cannot have been unfastening	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I unfasten?
can you unfasten?
can she unfasten?
can we unfasten?
can you unfasten?
can they unfasten? 	can I be unfastening?
can you be unfastening?
can she be unfastening?
can we be unfastening?
can you be unfastening?
can they be unfastening? 	can I have unfastened?
can you have unfastened?
can she have unfastened?
can we have unfastened?
can you have unfastened?
can they have unfastened? 	can I have been unfastening?
can you have been unfastening?
can she have been unfastening?
can we have been unfastening?
can you have been unfastening?
can they have been unfastening? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not unfasten?
can you not unfasten?
can she not unfasten?
can we not unfasten?
can you not unfasten?
can they not unfasten? 	can I not be unfastening?
can you not be unfastening?
can she not be unfastening?
can we not be unfastening?
can you not be unfastening?
can they not be unfastening? 	can I not have unfastened?
can you not have unfastened?
can she not have unfastened?
can we not have unfastened?
can you not have unfastened?
can they not have unfastened? 	can I not have been unfastening?
can you not have been unfastening?
can she not have been unfastening?
can we not have been unfastening?
can you not have been unfastening?
can they not have been unfastening?