should knock
Verbo regular: knock - knocked- knocked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I'd knock
you'd knock
she'd knock
we'd knock
you'd knock
they'd knock 	I'd be knocking
you'd be knocking
she'd be knocking
we'd be knocking
you'd be knocking
they'd be knocking	I should've knocked
you should've knocked
she should've knocked
we should've knocked
you should've knocked
they should've knocked	I should've been knocking
you should've been knocking
she should've been knocking
we should've been knocking
you should've been knocking
they should've been knocking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I shouldn't knock
you shouldn't knock
she shouldn't knock
we shouldn't knock
you shouldn't knock
they shouldn't knock 	I shouldn't be knocking
you shouldn't be knocking
she shouldn't be knocking
we shouldn't be knocking
you shouldn't be knocking
they shouldn't be knocking	I shouldn't have knocked
you shouldn't have knocked
she shouldn't have knocked
we shouldn't have knocked
you shouldn't have knocked
they shouldn't have knocked	I shouldn't have been knocking
you shouldn't have been knocking
she shouldn't have been knocking
we shouldn't have been knocking
you shouldn't have been knocking
they shouldn't have been knocking	

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

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