should knock
Verbo regular: knock - knocked- knocked

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

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