must fasten
Verbo regolare: fasten - fastened- fastened

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must fasten
you must fasten
he must fasten
we must fasten
you must fasten
they must fasten 	I must be fastening
you must be fastening
he must be fastening
we must be fastening
you must be fastening
they must be fastening	I must have fastened
you must have fastened
he must have fastened
we must have fastened
you must have fastened
they must have fastened	I must have been fastening
you must have been fastening
he must have been fastening
we must have been fastening
you must have been fastening
they must have been fastening	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I mustn't fasten
you mustn't fasten
he mustn't fasten
we mustn't fasten
you mustn't fasten
they mustn't fasten 	I mustn't be fastening
you mustn't be fastening
he mustn't be fastening
we mustn't be fastening
you mustn't be fastening
they mustn't be fastening	I mustn't have fastened
you mustn't have fastened
he mustn't have fastened
we mustn't have fastened
you mustn't have fastened
they mustn't have fastened	I mustn't have been fastening
you mustn't have been fastening
he mustn't have been fastening
we mustn't have been fastening
you mustn't have been fastening
they mustn't have been fastening	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I fasten?
must you fasten?
must he fasten?
must we fasten?
must you fasten?
must they fasten? 	must I be fastening?
must you be fastening?
must he be fastening?
must we be fastening?
must you be fastening?
must they be fastening? 	must I have fastened?
must you have fastened?
must he have fastened?
must we have fastened?
must you have fastened?
must they have fastened? 	must I have been fastening?
must you have been fastening?
must he have been fastening?
must we have been fastening?
must you have been fastening?
must they have been fastening? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
mustn't I fasten?
mustn't you fasten?
mustn't he fasten?
mustn't we fasten?
mustn't you fasten?
mustn't they fasten? 	mustn't I be fastening?
mustn't you be fastening?
mustn't he be fastening?
mustn't we be fastening?
mustn't you be fastening?
mustn't they be fastening? 	mustn't I have fastened?
mustn't you have fastened?
mustn't he have fastened?
mustn't we have fastened?
mustn't you have fastened?
mustn't they have fastened? 	mustn't I have been fastening?
mustn't you have been fastening?
mustn't he have been fastening?
mustn't we have been fastening?
mustn't you have been fastening?
mustn't they have been fastening?