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
she must fasten
we must fasten
you must fasten
they must fasten 	I must be fastening
you must be fastening
she must be fastening
we must be fastening
you must be fastening
they must be fastening	I must have fastened
you must have fastened
she 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
she 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 must not fasten
you must not fasten
she must not fasten
we must not fasten
you must not fasten
they must not fasten 	I must not be fastening
you must not be fastening
she must not be fastening
we must not be fastening
you must not be fastening
they must not be fastening	I must not have fastened
you must not have fastened
she must not have fastened
we must not have fastened
you must not have fastened
they must not have fastened	I must not have been fastening
you must not have been fastening
she must not have been fastening
we must not have been fastening
you must not have been fastening
they must not have been fastening	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I fasten?
must you fasten?
must she fasten?
must we fasten?
must you fasten?
must they fasten? 	must I be fastening?
must you be fastening?
must she be fastening?
must we be fastening?
must you be fastening?
must they be fastening? 	must I have fastened?
must you have fastened?
must she 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 she 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 	
must I not fasten?
must you not fasten?
must she not fasten?
must we not fasten?
must you not fasten?
must they not fasten? 	must I not be fastening?
must you not be fastening?
must she not be fastening?
must we not be fastening?
must you not be fastening?
must they not be fastening? 	must I not have fastened?
must you not have fastened?
must she not have fastened?
must we not have fastened?
must you not have fastened?
must they not have fastened? 	must I not have been fastening?
must you not have been fastening?
must she not have been fastening?
must we not have been fastening?
must you not have been fastening?
must they not have been fastening?