must muff
Verbo regular: muff - muffed- muffed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must muff
you must muff
she must muff
we must muff
you must muff
they must muff 	I must be muffing
you must be muffing
she must be muffing
we must be muffing
you must be muffing
they must be muffing	I must have muffed
you must have muffed
she must have muffed
we must have muffed
you must have muffed
they must have muffed	I must have been muffing
you must have been muffing
she must have been muffing
we must have been muffing
you must have been muffing
they must have been muffing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not muff
you must not muff
she must not muff
we must not muff
you must not muff
they must not muff 	I must not be muffing
you must not be muffing
she must not be muffing
we must not be muffing
you must not be muffing
they must not be muffing	I must not have muffed
you must not have muffed
she must not have muffed
we must not have muffed
you must not have muffed
they must not have muffed	I must not have been muffing
you must not have been muffing
she must not have been muffing
we must not have been muffing
you must not have been muffing
they must not have been muffing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I muff?
must you muff?
must she muff?
must we muff?
must you muff?
must they muff? 	must I be muffing?
must you be muffing?
must she be muffing?
must we be muffing?
must you be muffing?
must they be muffing? 	must I have muffed?
must you have muffed?
must she have muffed?
must we have muffed?
must you have muffed?
must they have muffed? 	must I have been muffing?
must you have been muffing?
must she have been muffing?
must we have been muffing?
must you have been muffing?
must they have been muffing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not muff?
must you not muff?
must she not muff?
must we not muff?
must you not muff?
must they not muff? 	must I not be muffing?
must you not be muffing?
must she not be muffing?
must we not be muffing?
must you not be muffing?
must they not be muffing? 	must I not have muffed?
must you not have muffed?
must she not have muffed?
must we not have muffed?
must you not have muffed?
must they not have muffed? 	must I not have been muffing?
must you not have been muffing?
must she not have been muffing?
must we not have been muffing?
must you not have been muffing?
must they not have been muffing?