English verb conjugation
SHOULD KNOCK

Regular verb: knock - knocked - knocked

Affirmation

Simple form	V-ing form
I should knock you should knock he should knock we should knock you should knock they should knock	I should be knocking you should be knocking he should be knocking we should be knocking you should be knocking they should be knocking
Perfect	V-ing perfect
I should have knocked you should have knocked he 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 he should have been knocking we should have been knocking you should have been knocking they should have been knocking

Negation

Simple form	V-ing form
I should not knock you should not knock he 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 he should not be knocking we should not be knocking you should not be knocking they should not be knocking
Perfect	V-ing perfect
I should not have knocked you should not have knocked he 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 he should not have been knocking we should not have been knocking you should not have been knocking they should not have been knocking

Interrogative form

Simple form	V-ing form
should I knock? should you knock? should he knock? should we knock? should you knock? should they knock?	should I be knocking? should you be knocking? should he be knocking? should we be knocking? should you be knocking? should they be knocking?
Perfect	V-ing perfect
should I have knocked? should you have knocked? should he 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 he have been knocking? should we have been knocking? should you have been knocking? should they have been knocking?

Interro-negative form

Simple form	V-ing form
should I not knock? should you not knock? should he 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 he not be knocking? should we not be knocking? should you not be knocking? should they not be knocking?
Perfect	V-ing perfect
should I not have knocked? should you not have knocked? should he 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 he not have been knocking? should we not have been knocking? should you not have been knocking? should they not have been knocking?