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
he can unfasten
we can unfasten
you can unfasten
they can unfasten 	I can be unfastening
you can be unfastening
he can be unfastening
we can be unfastening
you can be unfastening
they can be unfastening	I can have unfastened
you can have unfastened
he 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
he 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 can't unfasten
you can't unfasten
he can't unfasten
we can't unfasten
you can't unfasten
they can't unfasten 	I can't be unfastening
you can't be unfastening
he can't be unfastening
we can't be unfastening
you can't be unfastening
they can't be unfastening	I can't have unfastened
you can't have unfastened
he can't have unfastened
we can't have unfastened
you can't have unfastened
they can't have unfastened	I can't have been unfastening
you can't have been unfastening
he can't have been unfastening
we can't have been unfastening
you can't have been unfastening
they can't have been unfastening	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I unfasten?
can you unfasten?
can he unfasten?
can we unfasten?
can you unfasten?
can they unfasten? 	can I be unfastening?
can you be unfastening?
can he be unfastening?
can we be unfastening?
can you be unfastening?
can they be unfastening? 	can I have unfastened?
can you have unfastened?
can he 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 he 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't I unfasten?
can't you unfasten?
can't he unfasten?
can't we unfasten?
can't you unfasten?
can't they unfasten? 	can't I be unfastening?
can't you be unfastening?
can't he be unfastening?
can't we be unfastening?
can't you be unfastening?
can't they be unfastening? 	can't I have unfastened?
can't you have unfastened?
can't he have unfastened?
can't we have unfastened?
can't you have unfastened?
can't they have unfastened? 	can't I have been unfastening?
can't you have been unfastening?
can't he have been unfastening?
can't we have been unfastening?
can't you have been unfastening?
can't they have been unfastening?