must cancel
Verbo regular: cancel - cancelled- cancelled

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must cancel
you must cancel
she must cancel
we must cancel
you must cancel
they must cancel 	I must be cancelling
you must be cancelling
she must be cancelling
we must be cancelling
you must be cancelling
they must be cancelling	I must have cancelled
you must have cancelled
she must have cancelled
we must have cancelled
you must have cancelled
they must have cancelled	I must have been cancelling
you must have been cancelling
she must have been cancelling
we must have been cancelling
you must have been cancelling
they must have been cancelling	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not cancel
you must not cancel
she must not cancel
we must not cancel
you must not cancel
they must not cancel 	I must not be cancelling
you must not be cancelling
she must not be cancelling
we must not be cancelling
you must not be cancelling
they must not be cancelling	I must not have cancelled
you must not have cancelled
she must not have cancelled
we must not have cancelled
you must not have cancelled
they must not have cancelled	I must not have been cancelling
you must not have been cancelling
she must not have been cancelling
we must not have been cancelling
you must not have been cancelling
they must not have been cancelling	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I cancel?
must you cancel?
must she cancel?
must we cancel?
must you cancel?
must they cancel? 	must I be cancelling?
must you be cancelling?
must she be cancelling?
must we be cancelling?
must you be cancelling?
must they be cancelling? 	must I have cancelled?
must you have cancelled?
must she have cancelled?
must we have cancelled?
must you have cancelled?
must they have cancelled? 	must I have been cancelling?
must you have been cancelling?
must she have been cancelling?
must we have been cancelling?
must you have been cancelling?
must they have been cancelling? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not cancel?
must you not cancel?
must she not cancel?
must we not cancel?
must you not cancel?
must they not cancel? 	must I not be cancelling?
must you not be cancelling?
must she not be cancelling?
must we not be cancelling?
must you not be cancelling?
must they not be cancelling? 	must I not have cancelled?
must you not have cancelled?
must she not have cancelled?
must we not have cancelled?
must you not have cancelled?
must they not have cancelled? 	must I not have been cancelling?
must you not have been cancelling?
must she not have been cancelling?
must we not have been cancelling?
must you not have been cancelling?
must they not have been cancelling?