must knock
Verbo regular: knock - knocked- knocked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must knock
you must knock
she must knock
we must knock
you must knock
they must knock 	I must be knocking
you must be knocking
she must be knocking
we must be knocking
you must be knocking
they must be knocking	I must have knocked
you must have knocked
she must have knocked
we must have knocked
you must have knocked
they must have knocked	I must have been knocking
you must have been knocking
she must have been knocking
we must have been knocking
you must have been knocking
they must have been knocking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not knock
you must not knock
she must not knock
we must not knock
you must not knock
they must not knock 	I must not be knocking
you must not be knocking
she must not be knocking
we must not be knocking
you must not be knocking
they must not be knocking	I must not have knocked
you must not have knocked
she must not have knocked
we must not have knocked
you must not have knocked
they must not have knocked	I must not have been knocking
you must not have been knocking
she must not have been knocking
we must not have been knocking
you must not have been knocking
they must not have been knocking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I knock?
must you knock?
must she knock?
must we knock?
must you knock?
must they knock? 	must I be knocking?
must you be knocking?
must she be knocking?
must we be knocking?
must you be knocking?
must they be knocking? 	must I have knocked?
must you have knocked?
must she have knocked?
must we have knocked?
must you have knocked?
must they have knocked? 	must I have been knocking?
must you have been knocking?
must she have been knocking?
must we have been knocking?
must you have been knocking?
must they have been knocking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not knock?
must you not knock?
must she not knock?
must we not knock?
must you not knock?
must they not knock? 	must I not be knocking?
must you not be knocking?
must she not be knocking?
must we not be knocking?
must you not be knocking?
must they not be knocking? 	must I not have knocked?
must you not have knocked?
must she not have knocked?
must we not have knocked?
must you not have knocked?
must they not have knocked? 	must I not have been knocking?
must you not have been knocking?
must she not have been knocking?
must we not have been knocking?
must you not have been knocking?
must they not have been knocking?