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 mustn't knock
you mustn't knock
she mustn't knock
we mustn't knock
you mustn't knock
they mustn't knock 	I mustn't be knocking
you mustn't be knocking
she mustn't be knocking
we mustn't be knocking
you mustn't be knocking
they mustn't be knocking	I mustn't have knocked
you mustn't have knocked
she mustn't have knocked
we mustn't have knocked
you mustn't have knocked
they mustn't have knocked	I mustn't have been knocking
you mustn't have been knocking
she mustn't have been knocking
we mustn't have been knocking
you mustn't have been knocking
they mustn't 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 	
mustn't I knock?
mustn't you knock?
mustn't she knock?
mustn't we knock?
mustn't you knock?
mustn't they knock? 	mustn't I be knocking?
mustn't you be knocking?
mustn't she be knocking?
mustn't we be knocking?
mustn't you be knocking?
mustn't they be knocking? 	mustn't I have knocked?
mustn't you have knocked?
mustn't she have knocked?
mustn't we have knocked?
mustn't you have knocked?
mustn't they have knocked? 	mustn't I have been knocking?
mustn't you have been knocking?
mustn't she have been knocking?
mustn't we have been knocking?
mustn't you have been knocking?
mustn't they have been knocking?