must unfasten
Verbe régulier : unfasten - unfastened- unfastened
Traduction française : défaire - ouvrir 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must unfasten
you must unfasten
she must unfasten
we must unfasten
you must unfasten
they must unfasten 	I must be unfastening
you must be unfastening
she must be unfastening
we must be unfastening
you must be unfastening
they must be unfastening	I must have unfastened
you must have unfastened
she must have unfastened
we must have unfastened
you must have unfastened
they must have unfastened	I must have been unfastening
you must have been unfastening
she must have been unfastening
we must have been unfastening
you must have been unfastening
they must have been unfastening	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must not unfasten
you must not unfasten
she must not unfasten
we must not unfasten
you must not unfasten
they must not unfasten 	I must not be unfastening
you must not be unfastening
she must not be unfastening
we must not be unfastening
you must not be unfastening
they must not be unfastening	I must not have unfastened
you must not have unfastened
she must not have unfastened
we must not have unfastened
you must not have unfastened
they must not have unfastened	I must not have been unfastening
you must not have been unfastening
she must not have been unfastening
we must not have been unfastening
you must not have been unfastening
they must not have been unfastening	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I unfasten?
must you unfasten?
must she unfasten?
must we unfasten?
must you unfasten?
must they unfasten? 	must I be unfastening?
must you be unfastening?
must she be unfastening?
must we be unfastening?
must you be unfastening?
must they be unfastening? 	must I have unfastened?
must you have unfastened?
must she have unfastened?
must we have unfastened?
must you have unfastened?
must they have unfastened? 	must I have been unfastening?
must you have been unfastening?
must she have been unfastening?
must we have been unfastening?
must you have been unfastening?
must they have been unfastening? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I not unfasten?
must you not unfasten?
must she not unfasten?
must we not unfasten?
must you not unfasten?
must they not unfasten? 	must I not be unfastening?
must you not be unfastening?
must she not be unfastening?
must we not be unfastening?
must you not be unfastening?
must they not be unfastening? 	must I not have unfastened?
must you not have unfastened?
must she not have unfastened?
must we not have unfastened?
must you not have unfastened?
must they not have unfastened? 	must I not have been unfastening?
must you not have been unfastening?
must she not have been unfastening?
must we not have been unfastening?
must you not have been unfastening?
must they not have been unfastening?