must refasten
Verbo regular: refasten - refastened- refastened

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must refasten
you must refasten
he must refasten
we must refasten
you must refasten
they must refasten 	I must be refastening
you must be refastening
he must be refastening
we must be refastening
you must be refastening
they must be refastening	I must have refastened
you must have refastened
he 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
he must have been refastening
we must have been refastening
you must have been refastening
they must have been refastening	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not refasten
you must not refasten
he 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
he 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
he 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
he must not have been refastening
we must not have been refastening
you must not have been refastening
they must not have been refastening	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I refasten?
must you refasten?
must he refasten?
must we refasten?
must you refasten?
must they refasten? 	must I be refastening?
must you be refastening?
must he be refastening?
must we be refastening?
must you be refastening?
must they be refastening? 	must I have refastened?
must you have refastened?
must he 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 he have been refastening?
must we have been refastening?
must you have been refastening?
must they have been refastening? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not refasten?
must you not refasten?
must he 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 he 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 he 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 he not have been refastening?
must we not have been refastening?
must you not have been refastening?
must they not have been refastening?