must refasten
Regular verb: refasten - refastened- refastened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must refasten
you must refasten
she must refasten
we must refasten
you must refasten
they must refasten 	I must be refastening
you must be refastening
she must be refastening
we must be refastening
you must be refastening
they must be refastening	I must have refastened
you must have refastened
she must have refastened
we must have refastened
you must have refastened
they must have refastened	I must have been refastening
you must have been refastening
she must have been refastening
we must have been refastening
you must have been refastening
they must have been refastening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not refasten
you must not refasten
she must not refasten
we must not refasten
you must not refasten
they must not refasten 	I must not be refastening
you must not be refastening
she must not be refastening
we must not be refastening
you must not be refastening
they must not be refastening	I must not have refastened
you must not have refastened
she must not have refastened
we must not have refastened
you must not have refastened
they must not have refastened	I must not have been refastening
you must not have been refastening
she must not have been refastening
we must not have been refastening
you must not have been refastening
they must not have been refastening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I refasten?
must you refasten?
must she refasten?
must we refasten?
must you refasten?
must they refasten? 	must I be refastening?
must you be refastening?
must she be refastening?
must we be refastening?
must you be refastening?
must they be refastening? 	must I have refastened?
must you have refastened?
must she have refastened?
must we have refastened?
must you have refastened?
must they have refastened? 	must I have been refastening?
must you have been refastening?
must she have been refastening?
must we have been refastening?
must you have been refastening?
must they have been refastening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not refasten?
must you not refasten?
must she not refasten?
must we not refasten?
must you not refasten?
must they not refasten? 	must I not be refastening?
must you not be refastening?
must she not be refastening?
must we not be refastening?
must you not be refastening?
must they not be refastening? 	must I not have refastened?
must you not have refastened?
must she not have refastened?
must we not have refastened?
must you not have refastened?
must they not have refastened? 	must I not have been refastening?
must you not have been refastening?
must she not have been refastening?
must we not have been refastening?
must you not have been refastening?
must they not have been refastening?